most often needed 1950 - americanradiohistory.com · up cv v) tv ts 03 r-. 0 y) c) ea ea ea 0 ea ce...

Most Often Needed

1950RADIO

DIAGRAMSand Servicing Information

VOLUME 10

$25°

WIA:;""afkliEW

Compiled by

M. N. BEITMAN

SUPREME PUBLICATIONSCHICAGO

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS

07A/day aleIn this new volume covering "Most -Often -Needed

1950 Radio Diagrams and Servicing Information" youwill find all needed service material on AM and FMsets, combinations, and popular record changers,produced during the past year. By omitting dupli-cations and superfluous facts, this low priced,single volume is made to contain a year's supplyof diagrams and service data. The index to thematerial in this manual starts on page 3. We alsowant to call your attention to a complete INDEX,published as a separate booklet, giving correctreference to all radio, television, and changerslisted in all ten Supreme Publications radio diag-ram manuals and four FM and television manuals.This INDEX booklet is available for 25fl.

As in previous volumes, the majority of servicefacts presented have been prepared by various firmswhose products are covered. We extend our sincerethanks to all manufacturers represented in this newvolume for their fine cooperation and assistance inmaking this presentation possible. The fine spiritshown by these leading radio manufacturers in aidingservicemen in the field deserves recognition by allof us in the radio servicing profession.

June 15, 1950Chicago.

M. N. Beitman

Copyright, 1950, bySUPREME PUBLICATIONS,3727 W. 13th Street,

Chicago, Illinois

All rights reserved,including the rightto reproduce or quotethe contents of thisbook, or any portionthereof, in any form.


Always use this complete Index to find theservice data on the radio you are servicing.The various makes of radios are listed inalphabetical order by manufacturerls name.Under each make, models are listed in nume-rical order at the left of the column whilethe corresponding page numbers are given onthe right.

Admiral Corp.4R1 6

4R11 6

4812 6

6A2 7

6A21 7

6A22 7

6A 23 7

6Q1 8

6Q116Q12 8

6Q13 8

6Q14 8

6S1 9

6511 9

6512 9

6W1 106W11 106N12 106Y1 116118 116Y19 11

9E1 12-159E15 12-159E16 12-159E17 12-15RC400 16-23Changer 16-23

Airlinesee Montgomery W.

ArvinRE -260 97-98RE -273 99RE -274 96RE -278 100341T 96356T .

99357T 99360TFM 97-98361TFM 97-98440T 100

Buick980782980899

163164

Chevrolet986240 24986241 24986388 24986389 24

Coronado05RA1-43-7755A 5294RA1-43-8510B 5294RA1-43-8511B 52

Crosley Corp.10-102E 2610-103 2610-104W 2610-135 2810-136E 2810-137 2810-138 2810-139 2810-140 2810-145M 2910-307M 3010-310 2710-311 2710-313 2758XTA 2558XTW 25

Delcosee United Motors

DeWald Radio Mfg.D-508 32D-616 32C-800 31

Emerson Radio577579581586590591594595596599600601602605613616623636640642645652, 653656B, 657B120012B120023B120032B120034A120055A120071A120072A120075B120076B120080B120082A120083B120085A120101A, -B120106A120112120115120117A120122B

343335

36-37383935353340414041

42-4346413847484549445034

36-37443339354140

42-434441

36-374638474849

4550

:21


Firestone Tire4-B-31 51

Gamble-Skogmo05RA1-43-7755A94RA1-43-8510B94RA1-43-8511B

General Electric4SJ2A14SJ3A145J4A164 to 67123124125129131135136143145165186-3A218218H226500501505 to 509530600601603604650

Hudson Motor6E896MH889

525252

535353615555555454555562565753

58-5958-59

60616161616262626257

Car192192

Montgomery Ward05WG-1811B05OG-2745B05WG-275284BR-1517AS4HA-1527A84HA-1528A94WG-1059A94WG-2745A1059A1517A1518A1527A1528A1811B

4

6566636768686966696767686865

Mont. Ward, cont.2745 662748 63-642749 63-6427 51 63-6427 52 63-64

Motorola, cant.600 95700 70Changer 81-90

Noblitt-SparksRE -260 97-98RE -273 99

Motorola, Inc. RE -274 965A9B, -M, -S 71 RE -278 1005A9UB, -UM 71 341T 965J1, 5J1U 80 356T 995L1, 5L1U 80 357T 99

5M1, 5M1U 80 360TFM 97-985M2, 5M2U 80 361TFM 97-98C T9 92 440T 100CT10 92RC -36 81-90 Oldsmobile

49L11Q 76 982544 16649L13Q 76 982573 16658R11A to -16A 77 Philco Corp.59H1159H12I

7878

M-2050-522, -I

111-118102

59L11Q 79 50-524 10259L12Q 79 50-526 10259L14Q 79 50-620 10359R11 72 50-621 10159R12I 72 50-920 10559R13M 72 50-921 10559R14E 72 50-922 10559R15G 72 50-925 10459R16Y 72 50-926 104HS -62A 71 50-1420 10669L1169X11

7475

50-142150-1422

106106

69X12 I79FM21

7573

50-142350-1424

106107

79XM21 73 50-1718 10879XM22 73 51-631 110HS -165 71 51-934 109HS -167 72 Changer 111-118HS -168 73HS -175 74 PontiacHS -178 73 984570 165HS -181 75HS -183 76 R.C.A. VictorHS -184 77 BX6 119HS -187 79 7Q51X 120HS -206 78 8B41 122HS -223 80 8B42 122HS -224 80 8B43 122HS -249 80 8BX5 121HS -250 80 8BX54 121309 91 8BX55 121400 91 9BX5 121409 93 9BX56 123500 94 9EY3 127

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TUBE AND TRIMMER LOCATION

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VOLTAGE DATA All readings made between tube socket terminals and

B minus (terminal of On -Off switch). Range Switch in "Radio" position. Measured on 117 Volt AC line. Volume control minimum; dial turned to low end. Voltages measured with Vacuum Tube Voltmeter.

12S07 I2SK 7 128A6 12.75GT 35Z SGT

INSIDE BOTTOM VIEW

II taken with a 1000 ohm -per -volt meter, readings will be either lower or pract catty zero'On "Phono" thee. voltages will be zero. All other DC readings may be slightly higher.

StepDummy Antenna

in Series withSignal Generator

Connection ofSignal Generator

(High Side)


ReceiverGang

Setting

TrimmerDescription

TrimmerDesignation

Type ofAdjustment

1250 mmfd.condenser

Tuning condenser,antenna stator 455 KC

GangfullyMaximumopen

2nd IF1st IF

5A, B*C, D output

250 mmfd.condenser

Tuning condenser,antenna stator

Gangully

openOscillator E Maximum

output

Mount dial pointer. Set pointer to horizontal position with tuning condenser tuned to 1400 KC generator signal (see illustrationbelow). Rotate the tuning condenser until the pointer is in a vertical position (900 KC), then slip chassis in cabinet, carefullyguiding the pointer so that it locates between the dial escutcheon and the cabinet. Install antenna and chassis mounting bolts.The pointer and escutcheon may be mounted after installing the chassis in cabinet as follows: Set pointer to horizontal positionwith gang tuned to 1400 KC signal. Place escutcheon on cabinet. With long nose pliers slip the hairpin ends of the escutcheonmounting springs in holes of escutcheon tabs.

3

Loop of several turns ofwire, or place genera-tor lead close to re-

ceiver antenna foradequate signal.

No actualconnection (signal

by radiation)1400 KC

Tune ingenerator

signalAntenna fF Maximum

output

*Adjustments A and C made from the underside of the chassis If IF transformers have hollow core slugs, these adjustments mayall be made from the top of chassis, if you use alignment tool #98A30-7 obtainable from your Admiral distributor. The bottomIF slug adjustment may be reached through the hollow core in the upper slug.

Antenna Trimmer "F" should be aligned after chassis and antenna are mounted in cabinet.

PH

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSREPLACEMENT OF BATTERY PACK

Replace A -B battery pack with Ensign type AB50 pack, Ray -0 -Vac AB994, General 60A -6F6-5, Burgess F6A60 or otherequivalent.

Electrical characteristics .of the recommended battery packsprovide for equal life for both the A and B sections. The Asection may give satisfactory performance as low as 6.6 volts,the B section as low as 60 volts. Replace battery pack whenreception is weak and voltage has dropped below values givenabove.

To install a replacement battery pack, merely open the backof the cabinet, pull out the battery plug and slide out the run-down battery pack.

Slip a new battery pack into place, plug in the battery plug.

Voltage readings taken between tube socket terminals andB minus (metal shell of electrolytic condenser), unless other-wise shown.

Dial set to low frequency, no signal, and volume controlminimum.

Measurements made from 117 volts AC line. If measured fromDC line, voltages may be slightly lower.

Voltage readings taken with a vacuum tube voltmeter. Socketterminals marked with an asterisk * indicate much lowervoltage or zero voltage if measured with a 1000 ohm -per -voltmeter.

If measurements are made on battery operation, tube filamentand B plus voltages will vary with the condition of the batteries.These voltages will equal the terminal voltage of the A or Bbattery less the voltage drop through components.

RESISTORS

Symbol Description Part No.Ill 2.2 Megohms, 1/2 Watt 60B 8-225112 27,000 Ohms, I/2 Watt 60B 8-273R3 1 Megohm, Vs Watt 60B 8.105114 100,000 Ohms, 1/2 Watt 6011 8-104TI5 8,200 Ohms, I/2 Watt 60B 8.822R6 3.3 Megohms, 1/2 Watt 60B 8-335117 10 Megohms, 112 Watt 60B 8-106118 1 Megohm, Volume Control and

On -Off Switch 75B 1-26119 4.7 Megohms, I/2 Watt 60B 8-475RIO 470,000 Ohms, 1/2 Watt 60B 8-4741111 2.2 Megohms, t/2 Watt 6011 8-225R12 5.6 Megohms, V2 Watt 60B 8-5651113 47 Ohms, 1 Watt 60B 14-4701114 2,700 Ohms, 1 Watt 60B 14-2721115 2,400 Ohms, 2.5 Watt

Center -tapped Candohm 61A 5-3R16 1,500 Ohms, 1/2 Watt 60B 8-1521117 820 Ohms, I/2 Watt 60B 8-8211118 220 Ohms, 1/2 Watt 60B 8.2211119 150 Ohms, 1/2 Watt 60B 8-151

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Power change switch SW1 shownin operating position fromPower line.

thilbat CHASSIS 6Y1MODEL 6Y18, 6Y19


4ssFor Battery Operation Insert Plug Here.

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VOLTAGE DATAri

I.3

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*If taken with a 1000 ohm -per -volt meter, readings will be lower or zero.

CONDENSERSCl 250 mmfd., Ceramic 65B 6-5C2a Gang, 420.0 mmfd. (max.)

Ant. SectionIlC2b Gang, 193.8 mmfd. (max.)

RF SectionC2c Gang, 90.0 mmfd. (max.)

Osc. Section iC3 105 mmfd., Ceramic 65B 6-9C4 250 mmfd., Ceramic 6513 6-5C5 105 mmfd., Ceramic 65B 6-9

C6 .05 mfd., 200 Volts, Paper 64B 1-32C7 .001 mfd. min., Ceramic 65B 6-41C8 .005 mfd., 600 Volts, Paper 64B 1-12C9 .05 mfd., 200 Volts. Paper 64B 1-32C10 105 mmfd., Ceramic 65B 6-9CII .005 mfd., 600 Volts, Paper 64B 1-12C12 .001 mfd. min., Ceramic 65B 6-41C13 250 mmfd., Ceramic 65B 6-5

i

C14a 30 mfd., 150 VoltsC14b 40 mfd. 150 Volts Elect 67C 7-52Cl4c 20 mfd., 150 Volts

1R5CONY.

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C15 .18 mfd., 200 Volts, Paper 64A 2-2Note: In sets with model numbersending in "UL", C15 is .1 mfd., 400 V.

C16 .05 mid. 400 Volts, Paper 64B 1-22C17 100 mfd., 25 Volts, Elect 67A 4-6C18 .25 mfd., 200 Volts, Paper 6413 1-28C19 15 mmfd., 500 Volts, Ceramic 65B 6-18

COILS, TRANSFORMERS, ETC.LIL2L3L4T1T2T3M1

M2SW1

Antenna, Loop (Part of Cabinet)Coil, RF 69B 58Coil, Oscillator 69A 57Coil, Antenna Loading 69A 45-1Transformer, 1st IF 7211 55Transformer, 2nd IF 72B 56Transformer, Output 96A 21Speaker (4"x6" PM) and

Output Transformer 78B 38-1Rectifier, Selenium 93A 1.4Switch, Power Change

DPDT, for "N" models 77A 19-24PDT, for "UL" models 77A 19-1

SW2 Switch, On -Off (DPST) (Part of R8)

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list of parts on page 15.

MANUAL OF 1950 MOST -OFTEN-NEEDED RADIO DIAGRAMSCHASSIS 9E1

MODELS 9E15, 9E16, 9E17

Symbol

RESISTORS

Description Part No.

RI 1 Megohm, 1/2 Watt_..__........608 8-105R2 470 ohms, 1/2 Watt 6013 8-471

R3 22,000 ohms, 1/2 Watt 6013 8-223

R4 470 ohms, Y2 Watt ........... .... 8-471

R5 4,700 ohms, 1/2 Watt ........................60B 8-472

R6 27,000 ohms, 1 Watt 60B 14-273

R7 1.5 Megohms,1/2.............._......60B 8-155R8 1.5 Megohms, 1/2 Watt. ............ -.......60B 8-155

R9 1 Megohm, Y2 Watt 60B 8-105R10 27,000 ohms, 1 Watt 60B 14-273R11 4,700 ohms, 1/2 Watt.. _ ........ _ . .6013 8-472

R12 1 Megohm, 1/2 Watt 608 8-105R13 27,000 ohms, 1 Watt 60B 14-273

R14 4,700 ohms, 1/2 Watt 608 8-472*R15 47,000 ohms, 1/x Watt

R16 220,000 ohms, 1/2 Watt 60B 8-224

R17 390 ohms, 1/2 Watt................__._. _608 8-391

R18 27,000 ohms, 1/2 Watt.............._ 606 8-273R19 6,800 ohms, 1/2 Watt, 5%._ 608 7-682R23 6,800 ohms, 1/2 Watt, 5%... 608 7-682R21 47,000 ohms, 1/2 Watt .... . 608 8-473R22 10,000 ohms, 1/2 Watt 608 8-103R23 1 Megohm Volume Control... 75B 3-6

R24 4.7 Megohms, 1/2 Watt 60B 8-475

R25 2 Megohms Tone Control 75B 1-33

R26 1.5 Megohms, '/z Watt ..... 6013 8-155

R27 330,000 ohms, 1/2 Watt .. . 60B 8-334

R28 1.5 Megohms, 1/2 Watt 60B 8-155

R29 270,000 ohms, 1/2 Watt 60B 8-274

R30 270,000 ohms, 1/2 Watt ......... _ 60B 8-274R31 270 ohms, 2 Watt 6013 20-271

R32 270,000 ohms, 1/2 Watt 608 8-274

R33 47,000 ohms, 1/2 Watt. 60B 8-473

R34 470,000 ohms, 1/2 Watt 608 8-474R35 4.7 Megohms, 1/2 Watt 60B 8-475

Symbol

ClaClbClcCl d

CONDENSERS

Description Part No.

486 mmfd. (max) AM RF15 mmfd. (max) FM RF15 mmfd. (max) FM Osc.143 mmfd. max) AM Osc.

Gong 68 B25

IC2 35 mmfd., Zero Temp.Coeff., Ceramic 658 6-57

C3 7 mmfd., ± 1 mmfd., -.00047Temp. Coeff., Ceramic 65B

C4 .002 mfd., "Hi -K" Ceramic 656C5 .001 mfd. min., Ceramic...............658C6 3 to 12 mmfd., Trimmer

(Silver Ceramic) 66AC7 40 mmfd., 2%, Zero Temp.

6-459-386.41

19-2

6-22

C8 2 mmfd., ±5 Zero Temp.Coeff., Ceramic 65B 6-58

C9 50 mmfd., Ceramic.. .... . .... 65B 6-4C10 .005 mmfd., "Hi -K" Cera:n.c 65B 9-51C11 .005 mfd. min., Ceramic 65A 10-1C12 10 mmfd., Zero Temp. Coeff. 65B 6-44C13 .01 mfd. min., Ceramic. .. 65A 10-3C14 100 mmfd., 3%, Silver Mica.. ..... ..Part of T1C15 .01 mfd. min., Ceramic ....... ... .65A 10-3

C16 .01 mfd. min., Ceramic 65A 10-3C17 .01 mfd. min., Ceramic . 65A 10-3C18 200 mmfd., 3%, Silver Mica . Part of T4C19 .01 mfd. min., Ceramic. 65A 10-3C23 100 mmfd., 3%, Silver Mica......... Part of T2C21 200 mmfd., 3%, Silver Mica.........Part of T4C22 .01 mfd. min., Ceramic...............65A 10-3C23 .01 mfd min., Ceramic..... .....65A 10-3

C24 200 mmfd., 3%, Silver Mica Part of T5C25 .01 mfd. min., Ceramic. .65A 10-3C26 200 mmfd., 3%, Silver Mica.........Part of T5

POINTER SETTINGWith the gang open, the pointer should be at

the position as shown in the stringing diagram,that is, the end of the pointer should line up withthe "AM" lettering on the dial scale. If thepointer is in a different position, move it byhand while keeping the gang open.

AMA

Symbol Description Part No.

C27 90 mmfd., 3%, Silver Mica Port of T3*C28 100 mmfd., Ceramic*C29 100 mmfd., CeramicC30 100 mmfd., 5%, -.00075

Temp. Coeff., Ceramic 65B 6-7C31 100 mmfd., 5%, -.00075

Temp. Coeff., Ceramic 6513 6-7C32 .002 mfd., 600 Volts, Paper 64B 1-14C33 4 mfd., 150 Volts, Electrolytic 67A 4-2

C35a 30 mfd., 350 VoltsC35b 30 mfd., 350 Volts

C36 200 mmfd., "Hi -K" Ceramic 658 9-14C37 .005 mfd. min., Ceramic 65A 10-1C38 100 mmfd., Ceramic 65B 6-3C39 .005 mfd. min., Ceramic ..... - 65A 10-1C40 .01 mfd. min., Ceramic 65A 10-3C41 .02 mfd., 400 Volts, Paper 64B 1-24C42 .005 mfd. min., Ceramic 65A 10-1C43 .005 mfd. min., Ceramic 65A 10-1C44 .005 mfd. min., Ceramic ... 65A 10-1C45 .1 mfd., 400 Volts, Paper 64B 1-20C46 100 mmfd., Ceramic ... 65B 6-3C47 .1 mfd., 400 Volts, Paper... 648 1-20C48 .01 mfd. min., Ceramic 65A 10-3C49 .01 mfd. min., Ceramic 65A 10-3C50 .01 mfd. min., Ceramic . . 65A 10-3C51 .002 mfd., 600 Volts, Paper 648 1-14C52 .01 mfd. min., Ceramic 65A 10-3

* Part of encased Diode Filter Unit 63A3-1. Thisunit consists of R15, C28, C29 (see schematic).If a section of the unit becomes defective, replacewith exact duplicate or individual components ofproper value.

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2 TURNS

VOLTAGE CHART

Line Voltage 117.

Voltage readings taken with a vacuum tubevoltmeter. Socket terminals marked with anasterisk * indicate much lower voltage or zerovoltage if measured with a 1000 ohm -per -voltmeter.

Voltages read between socket terminals andground, unless otherwise indicated.

Band switch in FM position.

Dial turned to low frequency end.

Volume Control -minimum.

*If taken with a 1000 ohm -per -volt meter, readings will be lower or zero. 15

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSAdmiral RC400 Changer, continuedTo play 33 RPM records, set this knob so its indicatingarrow points to "33". When moving this knob to eitherposition, make sure that the knob "clicks" into position.

This control also has a center ("neutral") positionfor disengaging the rubber -tired idler wheel (47).The changer pan is not marked "neutral" but theposition can be felt when the Speed Change Knobis halfway between "33" and "45". In this position,the compound idler wheel is not in contact with thedrive shaft or the turntable. When the recordchanger is not going to be used for some time,set the speed change knob in the center position.

LOADING AND STARTING THE RECORD CHANGERTo load 45 RPM records, place as many as ten over

the 45 RPM centerpost so that the bottom record restson the record supports (8). To load 33 RPM records,place as many as ten over the 33 RPM centerpost sothat the bottom record rests on the ledge on the center -post (1) and the 33 RPM record support (17). Startthe changer by turning the Radio-Phono switch on theradio to the "Phono-On" position.

STOPPING AND UNLOADINGTurn changer off by turning Radio-Phono switch on

the radio to "Phono-Off" position. Do not turn changeroff during change cycle. To unload, merely lift recordsstraight up.

THE CHANGE CYCLE45 RPM OPERATION

(See Figures 2, 3 and 4)If at all possible, we recommend that you carefully

observe the operation of a changer that is in normaloperating condition. It is a good idea to rotate theturntable by hand and repeat the change cycle untilyou understand the function of each part.

The changer operates as follows: The turntable (38)is driven by the smaller of the two rubber tires on thecompound idler wheel (47), riding against the outerrim of the turntable.

The speed of the turntable is determined by thesetting of the speed change knob (19). When the knobis in the "45" position, the larger rubber tire on thecompound idler wheel (47) rides against the 45 RPMsection (larger diameter) of the motor drive shaft.When the knob is moved to "33", the compound idler

'133

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KNOB (18)__

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18

TURNTABLE (38)

COMPOUNDIDLER WHEEL

(47)

MOTOR DRIVESHAFT

33 RPM SECTION

45RPM SECTION

Figure 2. Compound Idler Wheel and Motor Drive Shaft.

wheel moves so that the larger tire rides against the 33RPM section (smaller diameter) of the motor driveshaft. See Figure 2.

The changer mechanism is driven through changecycle by the knurled hub of the turntable rotating therubber tired drive wheel (36). During normal playing,the drive wheel does not touch the knurled hub of theturntable. See Figure 3A. As the needle enters therecord spiral grooves and moves towards the centerpost,the pickup arm lever and stud (72) moves simul-taneously and rotates the trip bracket (61) counter-clockwise. Since the trip bracket and drive wheel areon the same shaft, the drive wheel is pivoted approxi-mately 10 degrees counter -clockwise. The rubber tirecontacts the knurled hub of the turntable, and is ro-tated in a counter -clockwise direction. See Figure 3B.

Figure 3A

DRIVE

WHEEL

(36)

DRIVE WHEELBRACKET

DRIVE WHEELSHIFT

DRIVEWHEEL MI

(35)

TURNTABLE HUB

(KNURLED)

Drive Wheel Positions.Figure 3B

The drive wheel shaft is fitted through the drivebracket (78) and is mounted OFF CENTER on thedrive wheel (36). Due to the cam action of the "off -center" drive wheel (36), rotation of the drive wheel,by the knurled hub of the turntable, forces the driveshaft out. Since the drive shaft is fitted through thedrive bracket (78), the drive bracket is pivoted aroundthe drive bracket hub. The cycle spring (76) main-tains pressure on the drive bracket so that the drivewheel tire is kept in contact with the knurled hub.After the changer has been tripped and the drivebracket begins to be pivoted by the movement of thedrive wheel, the arm lift incline (78A) on the drivebracket moves across the lift rod moving it upward.This lifts the pickup arm off of the record. Stud (78C)on the drive bracket now contacts the pickup arm leverand begins to move it so the pickup arm moves outfrom the center of the record.

At about this time, the push -off adjusting shaft (15)on the 45 RPM centerpost (2) starts moving up thepush -off incline (78B) on the drive bracket (78). Seefigure 12. This causes the push -off shaft to move upinto the centerpost. As the push -off shaft moves intothe centerpost. As the push -off shaft moves into thecenterpost, the slicers (5 and 6) ride on the incline ofthe slicer cam and consequently move out of the center -post. The record supports (8) are also brought into thecenterpost as each slicer is hooked to the record sup-port on the opposite side of the centerpost.

As the drive bracket continues to pivot, the pickuparm continues to move away from the record, the slicers(5 and 6) continue to come out, and the record sup-ports continue to pull in. When the pickup arm hasmoved to the right almost as far as it will go, the recordsupports (8) have pulled into the centerpost enough todrop the bottom record to the turntable and the slicersare out far enough to hold up the remainder of the stackof records.


The pickup arm lever control stud (72A) ridingagainst the indexing edge of the index bracket (65)controls the movement of the pickup arm. The indexbracket (65) and set down spring (64) prevent thepickup arm from moving out too far. (Later in thechange cycle the index bracket (65) and set -downspring (64) control the set -down point.)

At this point, the drive wheel (36) has gone throughone-half of its rotation and as the drive wheel continuesto rotate, the drive bracket (78) will begin to returnto its normal (out of change cycle) position.

The set -down spring (64) keeps the pickup arm lever(72) in contact with the arm control stud (78C) onthe drive bracket. Therefore as the drive bracket movesback toward its normal position, the pickup arm ismoved in toward the set -down point. When the pick-up arm lever stud (72A) has reached the indexingpoint (notch) in the index bracket, the pickup arm hasreached the set -down point and stops moving in towardthe centerpost. At this time, the drive bracket haspivoted to a point where the lift rod (32) starts mov-ing down the arm lift incline (78A) in the drive bracketand the pickup arm starts moving down toward therecord. When the arm has moved down about half-way, the second stud on the drive bracket (78D) movesthe index bracket (65) away from the stud on the pick-up arm lever so that the pickup arm is free to travelin on the lead in grooves on the record.

Almost simultaneously, the push -off adjusting shaft(15) is riding down the push -off incline (78B) on thedrive bracket. This allows the push -off return spring(11) on the centerpost to pull the cam and shaft as-sembly (9) down.

The record supports are forced out of the centerpostby their return spring (7) and the slicers are movedinto the centerpost by the slicer return springs (4).When the slicers are all the way in, the stack drops tothe record supports (8).

Figure 4. RC400 Bottom View (Assembled).

Admiral RC400 Changer, continued

The drive wheel is no longer in contact with theknurled hub but it is rotated approximately 20 degreesfurther by the drive wheel bracket, which is held againstthe knurled hub of the turntable by the drive wheelbracket spring (35).

When the drive wheel bracket has rotated past theknurled hub, the drive wheel must be rotated atiother10 degrees by the trip bracket (61), or reject lever (43),before it will contact the knurled hub and begin thechange cycle. When the reject knob (42) is moved tothe "Rej" position, the reject lever roller rotates thedrive wheel the necessary 10 degrees and the changecycle begins.

33 RPM OPERATION

The change cycle for 33 RPM operation is exactlythe same as for 45 RPM operation, except for changecycle time and the fact that 33 RPM records are sup-ported by the offset on the 33 RPM centerpost and the33 RPM record support (17), and are pushed off by thepush -off plate (16).

When the drive bracket (78) has pivoted to thepoint where the pickup arm is clear of the record, thestud (80A) on the push -off bracket (80) is movedby the slot (78E) in the drive bracket. This movementcauses the push -off plate (16) to pivot and push -offthe bottom record. The remainder of the records areheld back by the small sliding piece at the top of thecenterpost. When the drive bracket pivots back to itsnormal playing position, the push -off bracket stud(80A) follows the slot in the drive bracket and causesthe push -off plate to pivot back to its normal position.Then the record stack drops to the record support (17)from the push -off plate (16).

43 78B PUSH -OFF INCLINE

61

69 PICKUP ARMHEIGHT ADJ.

75 TRIP ADJ.SCREW

78A PICKUP ARMLIFT INCLINE

19

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSAdmiral RC400 Changer, continued

ADJUSTMENTSTRIP ADJUSTMENT

This record changer employs the position type trip;that is, it trips into change cycle when the needle in thepickup arm reaches a given distance from the centerof the record. If the trip is properly adjusted, therecord changer will trip into change cycle when theneedle is between 2" to 2-3/16" from the center of thehole in the turntable or approximately half way in onthe spiral groove in the center of the record.

If the record changer does not trip at the properposition, it will be necessary to adjust the trip adjust-ing screw (75). See figure 4. Turning this screw in(clockwise) moves the trip point away from the center -post. Turning it out, moves the trip point nearer tothe centerpost.

If the screw is turned all the way out, the changermay not trip. If it is turned in too far, the changermay trip before the record finishes playing.

33 RPM PUSH -OFF ADJUSTMENT(See Figures 1 and 4)

If 33 RPM records do not drop to the turntableduring change cycle, it may be necessary to correct thepush -off adjustment.

The push -off is properly adjusted when the leadingedge of the push -off plate (16) extends to a maximumof 1/32" beyond the edge of the record support (17)during change cycle.

To make this adjustment, proceed as follows:

1. With the record changer in change cycle, rotatethe turntable by hand until the pickup armSTOPS moving away from the centerpost.

2. Loosen the set screw (81) on the push -off bracket(80) and move the push -off plate (16) so thatits leading edge extends 1/32" beyond the edgeof the record support (17). Then tighten theset screw (81).

3. Load the record changer with 33 RPM records,place the changer in operation and keep rejectingrecords until the stack has been dropped to theturntable.

4. If records still do not drop properly, repeat steps1 through 3.

ADJUSTMENT OF SET -DOWN POINT(See Figures 4 and 5)

This record changer does not have a conventionalset -down screw adjustment. The pickup arm shouldset -down properly unless the Allen set screw (34) onthe pivot collar (33) is loosened, or excessive pressurehas been applied to the pickup arm.

20

When properly adjusted for correct set -down, theneedle point will set -down between 2-9/16" and2-10/16" from the near side of the 45 RPM center -post. (Between 3-5/16" and 3-6/16" from center ofthe hole in the turntable.) Making this adjustment for45 RPM records, automatically provides correct set -down for 33 RPM records.

If the pickup arm does not set -down properly, theset -down point adjustment should be made as follows:

1. Insert the 45 RPM centerpost (2); set the speedchange knob (19) to the "45" position; move thereject knob (42) to the "Rej" position and thenrotate the turntable (clockwise) by hand JUSTto the point where the pickup arm stops movingin toward the centerpost and starts moving down-ward. DO NOT ROTATE THE TURNTABLEBEYOND THIS POINT.

2. Insert a #6 Allen wrench into the Allen set scfetv(34) on the pivot collar (33) as shown in Figure5. Do NOT loosen the Allen set screw.

LOCKSCREW (24)

PIVOTSCREW(22)

PIVOTCOLLAR (33)

PICKUPARM (20)

LIFT ROD(32)

PERMANENTPIVOT

e6 ALLENWRENCH

ALLEN SETSCREW 34

STAND-OFF

Figure 5. Pickup Arm Mounting Detail.

3. From the underside of the changer, hold the pick-up arm lever and trip bracket assembly (72)STATIONARY so that it can not move downor to either side.

4. Slightly loosen the Allen set screw (34).

5. Place a ruler against the near side of the 45 RPMcenterpost and then move the pickup arm untilthe distance between the needle and centerpostis from 2-9/16" to 2-10/16".

6. Tighten the Allen set screw (34) VERY CARE-FULLY to avoid moving the pickup arm. Be-fore firmly tightening the Allen set screw, makesure that there is a little space (ten thousandthsof an inch) between the pivot collar (33) and thestand-off.

ADJUSTING THE PICKUP ARM HEIGHT

This record changer is designed so that when theneedle rests 1/16" above the changer pan, the pickuparm will automatically lift high enough during changecycle to clear the top record of a stack of ten 33 RPMrecords on the turntable and will not lift high enoughto strike the bottom record of a stack of 33 RPMrecords to be played.


DRIVE BRACKET 178)

PICKUP ARMLIFT INCLINE

PICKUP ARMLIFT ADJ. NUT (69)

LIFT ADJ. LOCK SPRING (68)

Figure 6. Adjusting Pickup Arm Height.

With the record changer out of change cycle andthe pickup arm clear of the turntable, adjust the pick-up arm lift adjusting nut (69) (see figure 6), so thatthe needle rests 1/16" above the top of the changerpan. Turning the nut (69) clockwise raises the pickuparm; turning it counter -clockwise lowers the pickup arm.

To check this adjustment, load the record changerwith ten 33 RPM records. Turn the changer on andreject records until the stack has been dropped to theturntable. The pickup arm should not lift high enoughto strike the bottom record (of the stack about to beplayed) but should lift high enough to play the tenthrecord on the turntable.

If, for some reason, the arm strikes the bottom recordor will not lift high enough to play the tenth record,a compromise adjustment should be made. That is,raise the arm slightly to make the arm lift higher orlower the arm slightly to prevent it from striking thebottom record.

RECORDUPPORT

(8)

LOCKIN

LUGS

LOCK NUT(14)

PUSH -OFFADJUSTING SHAFT

(IS)

Figure 7. 45 RPM Centerpost.

45 RPM CENTERPOST ADJUSTMENT

If 43 RPM records do not drop to the turntable asthey should, or if the turntable stalls during changecycle, it will be necessary to adjust the 45 RPMcenterpost, (2).

The push -off adjusting shaft (15) is the only ad-justment on this centerpost. When properly adjusted,the dimension from the bottom of the adjusting nut(14) to the end of the push -off adjusting shaft (15)is approximately y2 inch. To make an adjustment,proceed as follows:

I. Turn the set off. Push the Reject knob (42) tothe "Rej" position. Then rotate the turntableclockwise (to the right) by hand until the pick-up arm moves as far away from the turntable asit will go. Do not continue to rotate the turn-table beyond this point.

2. Insert the 45 RPM centerpost and lock it in place.

3. In this position the record supports (8) should bepulled into the centerpost until the top edge of the

Corner of recordsupport (8) must beslightly (1/32") in-side centerpost

wall.

Figure 8. 45 RPM Centerpost Adjustment.

record supports are just inside the centerpost.You should only be able to see approximately1/32 of an inch of the centerpost wall. Seefigure 8.

4. If the record supports do not pull into the center -post as far as the position shown in figure 8, re-move centerpost, loosen the locknut (14) and turnthe push -off adjusting shaft out (counter -clock-wise) approximately one half turn.

5. Insert the centerpost and check to see if the recordsupports "pull in" to the proper position. If theydo not, repeat step 4. If they pull in far enough,proceed with step 6.

6. Place a stack of 45 RPM records on the center -post and turn the record changer on. Push theReject knob to the "Rej" position and then keeprejecting records until the whole stack has beendropped to the turntable. If each record slidessmoothly down the centerpost, the adjustment issatisfactory.

IMPORTANT: If the turntable stalls during changecycle, the push -off adjusting shaft may have beenturned out too far. Remove the 45 RPM centerpostand run the changer through change cycle. If thechanger does not stall with the centerpost removed, turnthe push -off adjusting shaft in about four or five fullturns and repeat steps 1 through 6 above.

21


SERVICE AND REPAIRDISASSEMBLING THE 45 RPM CENTERPOST

(See Figure 9)To disassemble the centerpost for parts replacement

etc., proceed as follows:

1. Remove screws (12) from underside of center-post and lift up the centerpost cap (3). See figure9. CAUTION: When the centerpost cap (3) isoff, use extra care to keep from accidentally push-ing up on the push -off adjusting shaft (15). Ifthis shaft is puhed up, the slicer return springs(4) and slicers may fly off and be lost.

NOTE,MIST SLICEIr'')REMOVE!) NASA

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Figure 9. Disassembly of 45 RPM Centerpost.

2. Using a "long nose" pliers or tweezers, removethe slicer spring (4) which holds the top slicer(5) in place. Then remove the top slicer.(NOTE: This slicer has an offset. It must beremoved first when disassembling and installedlast when reassembling).

3. Remove the other slicer return spring and thebottom slicer (6).

4. Now, push up on the push -off adjusting shaft(15) until the record supports (8) come up overthe top of the centerpost.

5. Grasp both record supports with the thumb andtwo forefingers and lift them off of the slicercam (9A). Release record supports carefully sorecord support return spring (7) is not lost.

6. To remove the slicer cam and push -off assembly(9), remove the retaining ring (13) and the push -off return spring (11) from the underside of thecenterpost and lift the assembly off from the topof the centerpost.

When assembling the centerpost, merely reverse theabove procedure. When installing the record supports(8) and their return spring (7), place the spring be-tween the record supports and compress the springenough so the record supports can be slid down overthe slicer cam (9A). When installing the slicers (5and 6) be sure to install the flat slicer (5) first, andthen the slicer with the offset.

22

REMOVING THE PICKUP ARM(See Figure 5)

If the pickup arm must be removed for any reason,proceed as follows:

ImportantDo NOT loosen the Allen set screw (34) in the pivot

collar (33). If the screw is loosened, it will be neces-sary to make the set -down point adjustment.

1. Loosen the pivot locking screw (24) at the frontof the pickup arm counterweight (21).

2. Turn the pivot screw (22) almost all the wayout.

3. Move the pickup arm to the right to free thepermanent pivot (part of the counterweight)from the pivot hole in the pivot collar (33). Inearly production changers, it may be necessaryto use a slight twisting or "wiggling" motion tofree the permanent pivot. When the permanentpivot has been freed, merely lift the pickup armassembly up and off.

To reinstall the pickup arm assembly proceed asfollows:

1. Slide the counterweight down on the pivot collar(33) until the permanent pivot point falls intothe pivot hole in the pivot collar. In early pro-duction changers, it may be necessary to set thepermanent pivot point in the pivot hole and thentwist or "wiggle" the arm until the counterweightfalls into the proper position.

2. Tighten the pivot screw (22) until it is tight andthen back it off just enough so the pickup armcan move up and down freely.

3. Tighten the pivot locking screw (24).

REMOVING TURNTABLE (38) ANDTHRUST BEARING ASSEMBLY (40)

To remove the turntable first place the speed changeknob (19) in the "neutral" position. Being sure thatthe changer is not in change cycle, move the pickuparm away from the turntable. Then remove the re-taining clip (37) on top of the turntable and lift theturntable straight up.

Before replacing the turntable, see that the drivewheel (36) is not against the centerpost socket andmove the pickup arm as far as possible from the center -post. Be sure the speed change knob (19) is in the"neutral" position.

No force is needed to seat the turntable.Replace the turntable retaining clip (37) on the cen-

terpost socket so that its "turned -up" ends are facingupward and away from the pickup arm.

The cork washers (39) and thrust bearing assembly(40) are removed by sliding them over the centerpostsocket. Replace them in the order shown in figure 12.

LUBRICATIONUnder normal operating conditions, the motor should

never require oiling. Also, do NOT use oil on the 45RPM centerpost and do NOT oil the roller on thereject lever (43). Any oil on this roller will betransferred to the drive wheel tire when the reject knobis moved to the "Rej" position, which might cause thedrive wheel (36) to slip during change cycle. The

a

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSdrive shaft is fitted through an oilite bearing on thedrive bracket (78); it also should not require oil.

The rest of the changer, however, should be lubri-cated with grease whenever it comes into the shop forrepairs or adjustment. All pivot and friction pointsshould be greased adequately but not excessively. Agood automobile chassis grease may be used for thispurpose.

Admiral RC400 Changer, continuedThe push -off shaft (16) and the bearing in the turn-

table hub may be lubricated with SAE No. 20 oil.Care should be taken to prevent any of the lubricant

from coming into contact with the drive or idler wheeltires. Also, be careful when using oil, not to let anexcess seep into the felt of the turntable.

RECORD CHANGER TROUBLE SHOOTINGChanger Will Not Trip Into Change Cycle.

1. Check adjustment of trip adjusting screw (75).

2. Check for broken, loose or weak trip tensionspring (73).

3. Check for broken, missing or loose trip adjust-ing lock spring (74).

4. Check for oil or foreign material on the drivewheel tire (36).

5. Check to see that the drive bracket (78) is free(not binding) to pivot around drive bracket hub.

6. Check for broken cycle spring (76).

Changer Trips Into Change Cycle BeforeFinishing Record.

1. Check adjustment of trip adjusting screw (75).See paragraph under heading "Trip Adjustment."

Changer Will Not Reject.1. Check for oil or foreign material on the drive

wheel tire (36).2. Check to see that the drive bracket (78) is free

to pivot around the drive bracket hub.Pickup Arm Does Not Set Down Properly.

1. Check set -down adjustment. See paragraph un-der "Adjustment of Set -down Point".

Records Do Not Drop to Turntable.1. If 45 RPM records do not drop, adjust push -off

adjusting shaft (15). See paragraph underheading "45 RPM Centerpost Adjustment".

2. If 33 RPM records do not drop, check the push -off adjustment. See paragraph under heading"Push -off Adjustment".

Changer Stalls in Change Cycle.

1. Check for parts binding.

2. If changer stalls with 45 RPM centerpost inplace, adjust push -off adjusting shaft (15). Seeparagraph under heading "45 RPM CenterpostAdjustment".

Turntable Will Not Revolve When ChangerIs Turned On.

1. Check position of speed change knob (19). Ifit is in "neutral" position, the turntable will notrevolve.

2. Check for oil or foreign material on the tires ofthe compound idler wheel (47).

3. Check for broken idler wheel spring (50).

Changer Causes Rumble or Noise.

1. Check for broken or missing "float" springs (58).

2. Check for speed change knob shaft (19) rubbingagainst the edge of the cut-out in the changer pan.

Pickup Arm "Skips" Across Records.

1. Check to be sure that cabinet is level.

2. Check for worn needle.

CAUTIONS AND SERVICE HINTS

1. See that the rubber tires on both the drive wheel(36) and the compound idler wheel (47) are keptclean and free from oil, grease, dirt or any foreignmaterial. Carbona or carbon tetrachloride maybe used for cleaning these parts.

2. When handling the idler wheel or drive wheel,keep fingers and hands away from the rubbertires. Natural body oils on these parts maypossibly cause slippage.

3. When the turntable is off, do NOT push the drivewheel (26) against the centerpost socket.

4. If the record changer is not going to be used forsome time, place the speed -change knob (19) ill

the "neutral" position. This will eliminate thepossibility of denting the idler wheel tires (47).

5. When disassembling the 45 RPM centerpost, donot push up on push -off adjusting shaft (15),just after removing the centerpost cap (3).

6. When removing the pickup arm, do NOT loosenthe Allen set screw (34) in the pivot collar (33).

7. Do not oil the roller on the reject bracket (43).Oil will be transferred to the drive wheel tire (26)possibly causing slippage during change cycle.

8. When replacing the turntable retaining clip (37)be sure to slip it on with the "turned -up" endsfacing upward.

9. When removing or reinstalling turntable, makesure that the record changer is not in change cycleand that the speed change knob (19) is in the"neutral" position. 23

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SHORTWAVEGANGCLOSED -4.2

CONVERTER87 97

(81

I F. AMPLIFIER

O*24

0

dovvp 46-ra's.4,04.6.0t1114,041k 010 OP

11499910O 92

NOTES:I. BOTTOM VIEW OF TUBE SOCKETS.2 VOLTAGE MEASURED WITH AN

ELECTRONIC VOLTMETERFROM SOCKET LUG TO ( 9-)(PIN 5 OF 14H7)

3.LINE VOLTAGE 117 V. 60 CYCLE.4. N.C.* NO CONNECTION.5 W.J.* WIRING JUNCTION.6. * * AC. VOLTAGE7 SOCKET VOLTAGE TOLERANCE.± 10%

DET,AVCA:AMPL.

O W.J.

50 W.J

RECTIFIER114 *944vast.

jel CAIIkea*"

0 W.J.

OUTPUT

7

110

SA

Y1 -

to

I -F TRANS 2.. RAms4B6 ROA 5

SW

COIL

OSC

INTERMEDIATE FREQUENCY: 455 kc.

3.3

116 505.

3504

000

.00011.04Kre 151.

;.1.1. r.,!.tr-

ItemNo. Part No. Description Item

No. Part No. Description

1A1B23456

7A7B8A8B9

101112131415161718192021A21B22232425

AW-146155

AW-146139C-139919-4C-139919-3AC -135817C-137219-2

AW-144666

AB -144617

W-135808B-137498-1139477-4313-137498-2239477-4339477-4339477-3813-137498-1439477-4339477-4539477-4539477-47B-137649

B-142951-239373-6039373-4739373-102

Coil, Osc. M.W. \ TwoCoil, Osc. S.W. /SectionCoil, Ant. S.W.1st I.F. Trans.2nd I.F. Trans.Loop & Back Assy.Condenser, Trimmer, 1.5-12 mmf.

(Part of 5)Condenser, Tuning \ Two SectionCondenser, Tuning f VariableCondenser, Trimmer, 3.5-30 mmf.1 TwoCondenser, Trimmer, 3.5-30 mmf. r sect.Switch, Band ChangeCondenser, 50 mmf. 500 v. micaCondenser, .022 mfd., 600 v., paperCondenser, 220 mmf., 500 v., micaCondenser, .022 mfd., 600 v., paperCondenser, .022 mfd., 600 v., paperCondenser, .0033 mfd., 600 v., paperCondenser, 580 mmf., 300 v., micaCondenser, .022 mfd., 600 v., paperCondenser, .047 mfd., 600 v., paperCondenser, .047 mfd., 600 v., paperCondenser, .1 mfd., 600 v., paper

Condenser, 50 mfd. 150 v. Elect.Condenser, 30 mfd. 150 v. }Two sect.

Condenser, ResistorResistor, 22,000 ohms M w.Resistor, 4,700 ohms i z w.Resistor, 4.7 megohms .5/2 W.

262728293031323334A34B3636373839

39373-8739373-8739373-1639373-10039373-8439373-2639373-11939373-3439368-1439369-1C-146133Part of Item 35C-132300-1W-4885839373-8039232-1C-136721D-132136-1AW-134738W-134667C-136962W-134882W-134883B-134610B-134570W-5107139220-32 CPW-134917D-136565-4W-51752W-132124 SB

Resistor, 470,000 ohms 1/2 w.Resistor, 470,000 ohms Iz4 w.Resistor, 150 ohms w.Resistor, 3.3 megohm w.Resistor, 330,000 ohms w.Resistor, 470 ohm, w.Resistor, 47 ohm 1 w.Resistor, 1,200 ohm 1,:t w.Control, Volume, 1.0 megohmSwitch, Power (Part of 34A)SpeakerTransformer, OutputCable & Plug, PowerBulb (Dial), Type 47, 6.3 v., 15 amp.Resistor, 220,000 ohm, IA w.Socket, tubeBackground, DialCabinet (58XTA)Cabinet (58XTW)Clip, Dial PointerDial FaceKnob (58XTA)Knob (58XTW)Lens, DialPointer, DialRing, Retaining (Dial Drive Shaft)Screw, Chassis Mounting # 8-32 xShaft, Dial DriveSocket Assy., Dial LightSpring, Dial Drive CordStud, Trimount 25

MANUAL

CROF 1950

feMOST -OFTEN -NEEDED RADIO DIAGRAMS

MODELS 10-102E, 10-103, 10-104W

AlignmentSignal Generator Output

PositionSequence Frequency

in kc.In Series

with Toof

Dial PointerAdjust for

Maximum Output

1 455 200 mmf. High Sideof Loop 1620 A & B

Il 1620 *Radiated to Loop 1620 C

8 1400 *Radiated to Loop 1400 D

Place signal generator output

i 2

lead near the loop antenna.IF TRANSFORMER

VI V2 IF TRANSFORMER V3 V40 EA

12 BAS 12A44 SOC 501,__014FD.

6

1 5 011 0s0LOOP

11,,

il 2, o g 1,, o o L 1 -4 00022 TOR 0

/ 220' - 24.71

-t_I__ _ _ E,I

_, 00.13a--1 (-031WPAOS.

TX

IOWA.

C3A

0 02' FD

,220---37FD

/ 0

0 0 5 5 MEG VOLUME/CONTROL

I MEG 4/01

/,

r -I-l'''0'2'..

,_-"...'od/ / - a

cs. v5

-I-,/

// lenr

3504 1200 )

OUTGut .....

V3 V I V2 V4 /\A/\,5 3

a -T T

001)3 MFD

x9.7 04 /RFDOwl shr =I

DIAGRAM SYMBOL 0

1 otANFO

0'.-

sr 1000211- I

- - -

oggi

-11-11--11-iii ?WONG CONDENSER WO.

v2IF TRANSFORMER . s COMO PO515105

LENGTH or GI., cORD128A6 - - - - - 1046 LOUDNOTES

I. R 10002. 11,4911VM.3 ALL CAPACITANCE VALVES IN SSW MD IKSISTANCE

ALLIES NORMS UNLESS ONFRYFISE NOTED

/77/77 DENOTES CCHASSIS01101110

i I 1 ,,,

'I

5,40ENOTES COMMON MIMING OMITTEDFROM DRAWING FOR SAKE OF CLARITY.TORARO WRNS.

A i1.0

g

g

t In 11 II 7I CHASSIS

.." 1).. Ne .2_ _i

-C 38 C;L*34.,22

©

3300

OSC. TRIMMER

17K FR' S.

T 6

IF. si...

...1620 KC. .

ANT. TRIMMER 2ND t -p TRANS ADJUST TOP0 01400 KC. a BOTTOM SLUGS 455 KC.

I ST I -F TRANS ADJUST TOP ®a BOTTOM SLUGS 455 KC.

26 CHASSIS, TOP VIEW


-C-R-OSL-EY

MODELS: 10-310, 10-311, 10-313

FREQUENCY RANGE: 540 to 1600 kilocycles.INTERMEDIATE FREQUENCY: 455 kc.POWER SUPPLY: a.c.-d.c. or Battery.VOLTAGE RATING: a.c.-d.c., 110 to 120 volts.

"A" Battery, 41/2 volts ; "B" Battery, 90 volts.POWER OUTPUT: 200 M.W. maximum.POWER CONSUMPTION: 15 watts at 125 volts,60 cycle.

DET-AVC ISTAF AMPL

A 2.40.8 2.9

1.5

20

OUTPUT

7.0 £4.5.

1.5

2ND.I-F AMPLIFIER£90

A 90 86

AW-1.1 11

8483

4.53.0

teet A 4.53.0

*40/13.73.44.3

2.7

NC.

CONVERTER

A-8.4-8.4 al) 540KC.

14846

£9086

IST I -F AMPLIFIER12.3

2.9 £0.8

NOTES:I. BOTTOM VIEW OF TUBE SOCKETS.

2. VOLTAGES MEASURED WITH ANELECTRONIC VOLTMETER FROMSOCKET LUG TO B-

3. W. J.. WIRING JUNCTION.

4. NC =NO CONNECTION

5. r VOLTAGES MEASURED WITHRADIO PLUGED INTO 117 VOLT60 CYCLE LINE.

6. ALL OTHER VOLTAGES MEASUREDIN BATTERY OPERATION POSITIONWITH "A"r 4.5 VOLTS. "8='90 VOLTS.

7. SOCKET VOLTAGE TOLERANCE 10%

0-AMPI-100K

_

NOTES14,000

2 if .15505 ALL CAPECITANCIE VALUES 0 MOP 040LL

RESSISNIS 0LUE ONMS uNLESS0100.0 STED

0.10R ENE rERNolo0 ON IROP020RMERS000E0 MTN GREEN 00T, NUMBERS PROGRESSCLOCKWISE

S nd oc NOTES CONIOION

FFT OENOFES CIF0BS

TowROCwLsocS

Nocowfxr Of Cow PANE CoAo

TE nOSIO r0500.Co 001 soNDOL CO

11 :,1.te

.005OWIT

U

22x

Z.. I. MANS GE

7r

T. MEB MEM

20

2 00

.005IAFO

MEG

EG

At

Io

"...900 0 0

22 .220 200 X200 - F0

CHASSS FOR MATIERTOPERATION

0 0

-0 -C/i.00

wo

'os-o

27


-CROSIEY- MODEL 10-145M

AlignmentSequence

Signal Generator Output Position of

Adjust for MaximumFrequencyOutputin kc.

In Serieswith To

Radio-PhonoSwitch

TuningDial

1 455 200 mmf. Ant. Counter-clockwise Open A & B

(See Note 1)

2 1620 200 mmf Ant. Counter-clockwise Open C

(See Note 1)

3 1400 *Radiated to Loop Tune inSignal

D(See Note 2)

*Place signal generator output lead near the loop antenna.Notes: 1. Disconnect loop antenna. Connect a 33,000 ohm resistor from pin 8 on 12SA7 tube socket to B -(pin 4 on 12SQ7 tube socket).

2. Remove 33,000 ohm resistor, connect loop antenna and place receiver chassis in cabinet.

12;07IZSA7 ig57-F TRANS 2.11-F TRANS.

L00

/e

0r

=11o'0.'211..2

MEMED.

ra^OE

Icr.

.0002

L _ _

1'41145 841

§ 5.

c'sciTRIMM

o KG.us

. ADJUST TOP SCTTO LMB TAGS

455 KC

AG. PHONOMOTOR LEAD

NON°

HOE

I=1

0 MIED

CEA

a*

CVO

i 1

at ''''"I

ITO

vSOLD.

TOP

H30S

ADJUST TOP S BOTTOM

SLUGS 455 KC

AC PHONOMOTOR LEAD

3525

200

ANTENNA TRIMMER

1400 KG

00 000 0

NOTES

2 i-i 55 NC3 ALL CAPACITANCE VALUES MI NNE AND ALL RESISTANCE

VALUES IN OHMS UNLESS OTHERWISE NOTESP. BAND CTIANDE PRIT41 S.A. IN EXTREME COUNTER -CLOCANIS.E

POSITION SAITC21 SEOUENCE RADIO NORMAL TOW, RADIO BASSPPONO BASS. P.NO NORMAL TONE

ctoc, DENOTES COMMON WA.6..42 DENOTES CHASMS.

CHASSIS, TOP VIEW-MODEL 10-145M

TWAHE NG CAPACiTOR

TIE T CLOSED POSITIONLENGTH OP OIAL CORD IS

MOM LOOP ID LOOP

29

MANUAL OF 1950 MOST -OFTEN- I

-CROSLEY

MODEL : 10-307M

SELENIUMRECTIFIER

O OSC. TRIMMER /1620 KC.

CONNECT LOOPTO TRIMMER B 7

TUNING GANG FRAME

® ANTENNA TRIMMER /1400 KC.

LUG IN CHASSISRECECPTACLE FORBATTERY OPERATION

ADJUST TOP B

BOTTOM 455 PCB

A

B OTT'Tr°0PM 455I

CORD

SUPPORTS

BATTERY CABLEB PLUG

DET.-AVC. W -AF. AM PL.A 2.5

2.8

OUTPUT 7.6

9

6.37.3

W. J.

CONVERTER£0.9

2fA II -F. AMPLIFIER IA- I-EAMPLI FIER92 A2.5

4.9 92

*88 4.288

W.J.

86

CINIFGDI

0 8.

3.7

4G04.2

2.8

NOTES:

I .BOTTOM VIEW OF TUBE SOCKETS.

2.VOLTAGES MEASURED WITH ANELECTRONIC VOLTMETER FROMSOCKET LUG TO B-

3.W.J.. WIRING JUNCTION

4.NC. NO CONNECTION5 A . VOLTAGES MEASURED WITH

RADIO PLUGED INTO 117 VOLT60 CYCLE LINE

6.ALL OTHER VOLTAGES MEASUREDIN BATTERY OPERATION POSITIONWITH "A". 9VOLTS."Er. 90 VOLTS.

7. SOCKET VOLTAGE TOLERANCE 10%

ANT

V I

IRS I" I -F TRANS

NOM:5...0 45504

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IF=455 KC

646

EMERSON RADIO & PHONOGRAPH

Model 577, Chassis 1200123

ALIGNMENTVolume control should be at maximum position; output of signal generator should be no higher than necessary to obtain anoutput reading. Use an insulated alignment screwdriver.

DUMMYANTENNA

SIGNALGENERATORCOUPLING

SIGNALGENERATORFREQUENCY

RADIODIAL

SETTING

OUTPUTMETER ADJUST REMARKS

1 .1 mfd. High side to Pin 8 (grid)of 6SA7. Low side to

chassis.455KC Tuning cap.

fully open.Across

voice coil.Al, A2,A3, A4

Adjust for maximumoutput.

2 200 mmf.High side to ext. ant.

lead. Low side tochassis.

Tuning cap.fully closed.

79 A5 Adjust for minimumoutput.

3 200 mmf. II 1620KC Tuning cap.fully open. A6 Adjust for maximum

output

200 mmf. It 1400KC Tune formaximumoutput.

/I A7

5 200 mmf. 600KC Adjust outside turn of loopfor maximum output.

31 12 33 35 21 34 3655

15

1124

11 49 46 14 45 41 49 50

n- 11 //I325

25 23 47 42 43 12 9 34 49 21 35 II 28 17

44

13

3/

37

41

13

u

59 5 St 7 4

31 3t 1 IS 54

N4


Emerson RadioANT

lzIT

HS VA C.-D.C.

I2SA7VI

IS MEG

IF PEAKED AT 455 K.C.

I2SK7V2

12507- V3

'

5

212 .44IJOS

MODELS: 581, 594, 595CHASSIS MODELS: 120014A, 120071A

50LEGTV4

470 A 470

7->iso

05

PILOT

3 3525GTV5

2zr

002

CAP IN WO, NES IN OHMSUNLESS 07N2AWISE .0720

IO U

50 SO,Mr1)

DRIVE3 7 2 7 2 1 1

SW 3525 50L6 12SK7 125A7 12507 DIAL CORD DRIVE

CHASSIS 120014

INSTRUCTIONS FOR VOLTAGE AND RESISTANCE READINGS

1. Voltage readings are in d.c. volts and resistance readings in ohms unless otherwise specified.2. All measurements made with voltohmyst.3. Socket connections are shown as bottom views.4. Measured values are from socket pin to common negative, unless otherwise specified.5. Line voltage maintained at 117 volts for voltage readings.6. Nominal tolerance on component values makes possible a variation of ± 15% in voltage and resistance readings.7. Volume control at maximum with no signal applied, for voltage measurements.

VOLTAGE READINGS

SYMBOL TUBE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8

VI I2SA7GT 0 24 AC 95 95 -13 0 12 AC -2V2 12SK7GT 0 36 AC 0 -2 0 95 24 AC 95V3 12SQ7GT 0 -1 0 -2 -.5 55 0 12 ACV4 50L6GT NC 90 AC 110 95 0 NC 36 AC 6V5 35Z5GT NC 117 AC 112 AC 114 110 AC NC 90 AC 114

RESISTANCE READINGS

SYMBOL TUBE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8

V1 12SA7GT 0 48 1K* 1K* 24K 0 32 3 Meg.V2 1.^.SK7GT 0 60 0 3 Meg. 0 1K* 48 1K*V3 12SQ7GT 0 15 Meg. 0 3 Meg. .5 Meg. 540K* 0 32V4 50LAGT NC 110 160* 900* .5 Meg. NC 60 150VS 35Z5GT NC 148 143 0* 190 NC 110 0*

NC = no connection; K = kilohm; Meg. = megohm.* Readings taken to pin 8 of VS. 35

aiSee page 37 for

alignment facts.

CH

AS

SIS

120

0235

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSEmerson Radio Model 586, Chassis 120023B, 1200838

Circuit diagram and curves on page 36.

ALIGNMENT INSTRUCTIONS1. To position pointer, turn variable condenser fully closed and set pointer to reference mark on dial bookplate at the low frequency end of the dial.2. Volume control should be set at maximum position. The output of the signal generator should be no higher than necessary At-

tenuate the signal input as alignment proceeds. Use an insulated alignment tool for all adjustments.3. Use isolation transformer if available; otherwise connect a .1 mfd. condenser in series with low side of signal generator to chassis.

AM Alignment

_ANTENNA1

DUMMY SIGNAL GENERATORCOUPLING

SIGNAL GENERA-TOR FREQUENCY

BAND SWITCHPOSITION

RADIO DIALSETTING

OUTPUTMETER

ADJUST REMARKS

High side to Pinrid) of

65137Y. Low sideto chassis.

455 KC. Broadcast Tuningcondenserfully open.

Across voicecoil.

Al, A2, (Trans.T4). A3, A4,(Trans. T2).

A5,(Trimmer

cond. C6).

Adjust for maximumoutput. Reduce dummyantenna to .001 mfd. if

isolation trans. is not used.

Form loop of several turnsRadiate signal intoof

receiver loop. Adjust formaximum output.

2 Loop 1600 KC. BroadcastTuning

condenserfully open.

Across voicecoil.

Loop 1400 KC. BroadcastTune for

max. output.Across voice

coil.3A6, (Trimmer

cond. CS).Adjust for maximum

output.

FM I -F and Disc. Alignment Using AM Signal Generator and VTVM

DUMMYANTENNA

SIGNAL GENERATORCOUPLING


BAND SWITCHPOSITION

RADIO DIALSETTING

CONNECTVTVM ADJUST REMARKS

.01 mfd. High side to Pin 4(grid) of 6SG7 2nd

i.f (V4). Low side tochassis.

10.7 mc.(Unmodulated)

Frequencymodulation

Tuning con-denser fully

open.

Connect d.c.probe to point"A". Common

to chassis.

A7, A8,(Trans. T5).


2 .01 mfd.High side to Pin 4(grid) of 6SG7 1st

i-f (V3). Low side tochassis.


Frequencymodulation

Tuning con-fulldenser '''''Y

open

Connect d.c.Probe to point

A '. Commonto chassis.

A9, A10,(Trans. T3).


3 .01 mfd.High side to Pin 5(au. grid) of 6587Y

cony. (V2). Lowside to chassis.

10.7 mc.(Unmodulated)'

Frequencymodulation


open.


to chassis.

All, Al2,(Trans. T1).


4 .01 mfd.High side to Pin 4(grid) of 6SG7 2ndi-f (V4). Low side tooutput.

chassis.


Frequencymodulation


open.

Connect d.c.

P'Sillsi?".

toCommoniipoint

to chassis.

A13,(Trans. T6).

Adjust for maximum

5 .01 mfd.10.7 mc.

(Unmodulated)Frequencymodulation


open.

Connect d.c.probe to point"C". Common

to chassis.

A14,(Trans. T6).

Adjust for zero output.Continue with FM r -f

alignment.

Usescope

FM I -F and Disc. Alignment Using Sweep Signal Generator and Oscilloscope.frequency modulated signal, with 60 cycle modulation and 450 kc. sweep. Use 120 cycle sawtooth sweep voltage in oscillo-

for horizontal deflection.

DUMMYANTENNA



BAND SWITCH RADIO DIALPOSITION. SETTING

CONNECTOSCILLOSCOPE ADJUST REMARKS

1 .01 mfd.High side to Pin 4

(grid) of 6SG71st i-f (V3). Lowside to chassis.

10.7 mc.nmo(Udu.

lated).

Frequency Tuning con -modulation denser fully

open.

Vertical input toPoint "A". Ground

to chassis.

Al, A8,(Trans. T5).A9, A10,

(Trans. T3).

Adjust for maximum output(height) and symmetry asper 1-f alignment curve

shown.


rose. grid) of6587Y cony. (V2).Low side to chassis.

10.7 mc.(Unmodu-

lated).

Frequency Tuning con-modulation denser fully

open.

Vertical input toPoint "A". Ground

to chassis.All, Al2,

(Trans T1).A(dhieuistghtfranmdaxsyimmummetryoutp"as

per 1-f alignment curveshown.

3 .01 mfd. High siderfitleoftoosID

4

2nd 1-f (V4). Lowside to chassis.

10.7 inc.(Unmodu.

lated).

Tuning con-Frequency denser fullymodulation open.

input toPoint "C". Ground

to chassis.A13, A14,

(Trans. T6).

Alternately adjust A13 formaximum amplitude and

A14 for maximum straight.ness of cross -over lines,with cross -over occurring

at center of pattern as perdiscriminator alignment curve

Continue withFM r -f alignment.

FM R -F Alignment

DUMMYANTENNA



BAND SWITCHPOSITION

RADIO DIALSETTING


1 150 ohm re-

sistewithr ineachseries

gen. lead.

High side toFM ant. term.Low side to

chassis.

108.0 mc.(Unmodu-

lated).

Frequencymodulation

Tuning con.denser fully

open(108.0 mc.)


to chassis.

A15,(Trimmer

cond. C8).


2 f f 106.0 mc. Frequencymodulation

Tune formaximum

output.

f f A16,(Trimmer

cond. C7).


37


EMERSON RADIO

MODELS: 590, 623

CHASSIS MODELS: 120101A, 120101B

MODEL 590 MODEL 623

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Schematic Diagram, Models 590, 623-Chassis 120101A, B

7

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSEMERSON RADIO Model 605, Chassis 120076B

See page 43 for schematic diagram.

ALIGNMENT INSTRUCTIONSTo position pointer, turn vanable condenser fully closed and set pointer to reference mark on dial backplate at the low frequency end of the dial.Volume control should be set at maximum position. The output of the signal generator should be no higher than necessary to obtain an output readintenuate the signal input Us alignment proceeds. Use an insulated alignment tool for all adjustments.Use isolation transformer If available; otherwise connect a .1 mfd. condenser in series with low side of signal generator to chassis.

AM ALIGNMENT_,DUMMY

ANTENNASIGNAL GENERATOR

COUPLINGSIGNAL GENERA-TOR FREQUENCY

BAND SWITCHPOSITION

RADIO DIALSETTING

OUTPUTMETER

ADJUST REMARKS-,1

.1 mfd.High side to Pin

7 (grid) of12BA7. Low side

to chassis.

455 KC. Broadcast Tuningcondenserfully open.

Across voicecoil.

Al, A2, (Trans.T4). A3, A4,(Trans. T2).

Adjust for maximumoutput. Reduce dummyantenna to .001 mfd. If

isolation trans. is not used.

2 Loop 1600 KC. BroadcastTuning

condenserfully open.

Across voicecoil.

A5,(Trimmer

cond. C6).

Form loop of several tomsof wire. Radiate signal into

receiver loop. Adjust formaximum output.

3 Loop 1400 KC. BroadcastTune for

max. output.Across voice

i coil A6, (Trimmercond. C5).


FM I -F and Disc. Alignment Using AM Signal Generator and VTVMDUMMY

ANTENNASIGNAL GENERATOR

COUPLINGSIGNAL GENERA-TOR FREQUENCY

BAND SWITCHPOSITION

RADIO DIALSETTING

CONNECTVTVM

I

I

ADJUST REMARKS

.01 mfd.1

High side to Pin 1(grid) of 12BA6 2ndi.f (V4). Low side to

chassis


Frequencymodulation


open.


to chassis.

A7,( Trans. T5).


2 .01 mfd.High side to Pin 1(grid) of 12BA6 1st

&ft (V3). Low side ochassis.


Frequencymodulation


open.


to chassis.

A8, A9,(Trans. T3).



(am. grid) of 12BA7cony. (V2). Lowside to chassis.

10.7 mc,(Unmodulated)

Frequencymodulation

Tuning con-denser fullyutputopen.


to chassis.

A10, All,(Trans.(Trans T1).

Adjust for maximum

4 .01 mfd.Hiph side to Pin 1

(grid) of 12BA6 2ndi-f (V4). Low side to"B".chassis.


Frequencymodulation


open.

Connect d.c.probe to point

Commonto chassis.

Al2,(Trans. T6).


5 .01 mfd.10.7 mc.

(Unmodulated)Frequencymodulation


open.

Connect d.c.probe to point"C". Common

to chassis.

A13,(Trans. T6).

Adjust for zero output.Continue with FM r -f

alignment.

FM I -F AND DISC. ALIGNMENT USING SWEEP SIGNAL GENERATOR AND OSCILLOSCOPE. Use frequency modulated signal, with 60 cycle modulationand 450 kc sweep. Use 120 cycle sawtooth sweep voltage in oscilloscope for horizontal deflection.

DUMMYANTENNA



BAND SWITCH RADIO DIALPOSITION SETTING

CONNECTOSCILLOSCOPE ADJUST REMARKS

1 of mfd,High side to Pin 1

(grid) of 12BA6Low1st I-f (V3).

side to chassis.

10.7 mc.(Unmodu.

lated).

Frequency Tuning con-modulation denser fully

open.

Vertical input toPoint A . Ground

to chassis.

Al, AB, A9,(Trans. T5and T3).

Adjust for maximum output(height) and symmetry asper i-f alignment curve

shown (page43).


(am. grid) of12BA7 cony. (V2).Low side to chassis.

10.7 mc.(Unmodu-

lated).

Frequency Tuning con-modulation denser fully(height)

open.PointVertical,A input".GrGround

to chassis.(Trans.A, All,i.

Adjust for maximum outputand symmetry as

per i-f alignment curveshown (page43).

3 .01 mfd. High side 721141161

2nd i-f o(V4). Lowside to chassis.

10.7 mc.(Unmodu-

lated).

Tuning con-Frequency denser fullymodulation open.

Vertical input toPoint "C". Ground

to chassis.

Al2, A13,(Trans.T6).

Alternately adjust Al2 formaximum amplitude and

A13 for maximum straight -ness of cross -over lines,with cross -over occurring

at center of pattern as perdiscriminator alignment curve

(page43). Continue withFM r -f alignment.

FM R -F ALIGNMENT

DUMMYANTENNA



BAND SWITCHPOSITION

RADIO DIALSETTING


1 150 ohm re-sistor

ein

achseri es

withgen. lead.

High side toFM ant. term.Low side to

chassis.

108.0 mc.(Unmodu-

lated).

Frequencymodulation


open(108.0 mc.)


to chassis.

A14(Trimmer

cond. C8).


2

42PP PP 106.0 mc. Frequency

modulationTune formaximumoutput.

PP Al5(Trimmercond. C7).

Adjust for maximumoutput

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSEMERSON MODEL: 605

IF. AND LIMITER

CHASSIS MODEL: 120076B

Alignment information given on page 42.

Voltage and Resistance Readings

In charts below, voltage readings are inD.C. volts, resistance in ohms, unlessotherwise specified. D.C. measured at20,000 ohms/volt, A.C. at 1000 ohms/volt.Values measured from socket pin to com-mon negative. Line at 117 v., volume at

DISCRIMINATOR maximum, no signal applied.

VOLTAGE READINGS

SYMBOL TUBE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9

V1 12BA6 0 0 80AC 67AC 76* 78* .8* - -V2 12BA7 100 -.5 0 67AC 55AC 0 0 95V3 12BA6 -.2 0 55AC 43AC 93 98 0 - -V4 12BA6 0 0 43AC 30AC 70* 70* .6* - -V5 12AU6 -.4 0 30AC 18AC 50 50 0 - -V6 19T8 15* 18AC 0 -.8 0 -.5 33V7 35B5 0 6 117AC 80AC 132 100 NC - -

NC denotes no connection"; * for bandswitch in FM position only.

RESISTANCE READINGS

SYMBOL TUBE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9

V1 12BA6 0 0 16 12 65K* 65K* 66 - -V2 12BA7 65K 24K 1 56 75 0 0 0 65KV3 12BA6 2.8 meg. 0 56 44 65K 65K 0 - -V4 12BA6 68 0 44 32 65K 65K 68 - -VS 12AU6 100K 0 32 20 65K 65K 0 - -V6 19T8 90K 90K ' 50K 20 0 1 meg. 0 4 meg. 550KV7 35B5 400K 190 i 12 80 65K 65K NC - -

K-Kilohms; meg.-megohms.v,

12BA6

Km..5

4 6

/ SjIS

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PRO* REAR. SWITCH IN FR POSITION.

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSEMERSON RADIO & PHONOGRAPH CORPORATION

ALIGNMENT INSTRUCTIONS1. To position pointer, turn variable condenser fully closed and set pointer to reference mark

at low -frequency end of dial backplate.2. Volume control should be at maximum; output of signal generator should be no higher thanreading.3. Maintain loop in same position relative to chassis, if chassis is removed from cabinet.

MODEL: 640

CHASSIS MODEL: 120112

necessary to obtain an output

DUMMYANTENNA

SIGNALGENERATORCOUPLING

SIGNALGENERATORFREQUENCY

RADIODIAL

SETTINGOUTPUTMETER ADJUST REMARKS

1

2

.1 mfd. High side to pin 6(grid) of IRS. Low

side to chassis.

455 KC. Tuning con-denser fully

open.

Acrossvoice

coil.

T2 andT1

Adjust for maximum output.

Loop 1620 KC. If " C4(osc.

trimmer)

Fashion loop of several turnsof wire and radiate signal intoloop of receiver. Adjust for

maximum output.3 ,, 1400 KC. Tune

maximumoutput.

91 C3(Ant.

trimmer)Adjust for maximum output.

FRONT61U5

r

CD

0* 10 MEG.

'MEG. 41 67 450016 II '1'6' 58 383 MEG.*

1511'4

10 K*25 --- 0 -2.8450K* 0 0 i a se 4 MEG.

58 '<olit NC3S40 * 0-6 NO 1.3 -2.83.5MEG'. 4 .. 4 MEG.56 s , \i/ 1.3 58 380* 4500 16* I116

10 K*1.3 0 -6.84500 0 I t se 100K

....-'. s 4 NC-Voltage and Resistance Diagrams, Chassis 120112 1.3 -2.8

4500 4 MEG.

* MEASURED TO 13+1

CONDITIONS FOR VOLTAGE AND RESISTANCE READINGS1. Voltages indicated are positive d.c., resistances in ohms, unless otherwise noted.2. Measurements made with voltohmyst or equivalent.3. Socket connections are shown as bottom views, with measurements from pin to chassis.4. Volume control at maximum, no signal applied, for voltage measurements.5. Nominal tolerance in component valves makes possible a variation of 15'4 in readings.6. On the diagram, upper valves are voltage, lower valves are resistance; K is Kilohms, MEG is megohms. Resistance markedare measured to B+.

IRS 11'4VI V2._ V3

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSGamble-Skogmo, Coronado Radio Model 05RA1-43-7755A

0-3

NCP1-

30

6BE6 12ATI 6AV6 6V6GT

6A6 6AL5 6X5GT

itt itPHONO INPUT

FVlMOTOR'PHONO

DIPOLE ANTENNASOCKET

CONNECTIONS

6BA6

I2AT7

.4.

Frequency Ranges -Broadcast 540-1600 KCFrequency modulation 88-108 MC

Intermediate Frequency -AM 455 KC - FM 10.7 MC

HALO

-3-1L."4Z$'0.-ItHit

T-7 LJLAAMMA311

Aug (I705mAn5

POINTER CLAMP

LtZ'

A

DIAL BRACKET

DIAL STRING

DRIVESHAFT

TENSIONSPRING

a

C

GANG CONDENSERIN FULLY CLOSEDPOSITION.

Gamble-Skogmo, Coronado Radio Models 94RA1-43-8510B, & -8511B

Mr1,%'11-

52

6BA7

ow;6X5

M.1(INNTMS

3NOTE:COIL WINDINGS ON WHICH NO

OSG. COIL RESISTANCES ARE SHOWN HARE

4.1 A O.C. RESISTANCE Of LESSTHAN 0.1.

.11.11.121.211113. 611I.1

1000.

TM. grTMOV MV

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10 MEG.

Intermediate Frequency -AM 455 KC - FM 10.7 MC

1000A

11.12,F.

T2100

6V6ourPur AIL

--+-115-'

6800. 6800.


GENERAL ELECTRIC

MODEL 4SJ4A1

Model4SJ4A1Playtalk

PLAY

TALK

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1220 K-.15 2

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Model

4SJ2A1 20 MFD

7 2251.66T

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65 MA

MOTOR

105-125 VOLTS60 CYCLE

33

MODEL 4SJ3A1

TOY RADIO -PHONOGRAPH

SOCKET VOLTAGE DATA

128A7 128Q7 54IAGT 35760TPin Pin Pin Pin

1 Gnd 1 Gnd 1 0 1

2 24VAC 2 0 2 24VAC 2 80VAC

3 95V 3 Gnd 3 115V 3 90VAC

4 95V 4 0 4 95V 4

5 6%V 5 0 5 0 5 110VAC

6 0 6 35V 6 6

7 12VAC 7 0 7 75VAC 7 110VAC

8 0 8 12VAC 8 5V 8 120V

1.

VI12.SAl

\12.12547 vs

5oLt.67.

ALIGNMENT INSTRUCTIONSTurn S1 to Radio and volume to maximum. Connect an output meter across the speaker voice coil. Connectgenerator ground to B- through a .1 mfd. condensor, and the high side to pin 8 of the 12SA7 tube through .03mfd. Tune generator to 445 kc. and tune T1 trimmers for maximum output reading.

2. Remove generator connection to pin 8, unsolder antenna and attach generator to Ll through 25 mmfd. Turntuning condenser of set fully open. Set generator to 1620 kc. Tune oscillator trimmer on tuning gang for maxi-mum reading; set R.F. trimmer for maximum output reading. Use only enough generator output to get areading on the output meter. 53

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS3. Connect a standard output meter across the speaker voice

coil. Turn volume control full on. Keep signal generator output

GENERAL ELECTRIC low so that output meter indicates not more than IA watt duringalignment.

4. Align the AM oscillator trimmer (C13) and the AM r -fMODEL 218 trimmer (C9) by coupling the signal to the loop antenna induc-

tively. Connect a four -turn, six-inch diameter loop of bell wireacross the signal generator output terminals, and locate the loopALIGNMENT about one foot from the radio loop antenna. The position of the

EQUIPMENT NECESSARY FOR METER ALIGNMENT loop in respect to the radio loop antenna should not be changedduring any one set of adjustments to prevent possible errors in

1. Signal generator G -E YGS-3, or equivalent. the peak readings.2. 20,000 ohm -per -volt meter. 5. Disconnect the copper strap from the band switch to pin3. Output meter. 7 of the 12BE6 to align the 1st FM i-f transformer. Unsolder the

strap from the tube pin connection. Resolder the strap after T14. .01 mfd. capacitor, is aligned to 10.7 mc as in step 8.5. Four -turn, six-inch diameter loop of bell wire for AM, r -f

and oscillator alignment.6. The AM r -f alignment should be made before the FM r -f

6. Isolation transformer. alignment. With the gang condenser fully closed, the pointerNOTES FOR METER ALIGNMENT should point to the dot on the dial scale after the letters "FM"

on the left end of the dial scale.1. Connect a 20,000 ohm -per -volt meter from junction of

C29 and R18 to chassis. Use a ten -volt scale for steps 3, 4 and 5. 7. The termination impedance of the signal generator should2. Connect a 20,000 ohm -per -volt meter from the grid of be 300 ohms for FM r -f alignment.

the limiter (pin 1 of V4) to cathode of limiter (pins 2 or 7 of V4) MODEL 218 "H" VERSIONin series with a 200,000 -ohm resistor. The resistor must be con-nected directly to the grid pin to minimize capacity loading and It is the same as the Model 218 except that the local oscillatorto isolate the i-f signal voltage from the meter. Keep signal gen- is designed to operate on the high side of the incoming signal onerator down so that the meter does not indicate more than one FM reception. This change reduces the possibility of localvolt at the grid (5 microamps through 200,000 ohms). oscillator radiation interfering with television reception.

METER ALIGNMENT CHART

StepSignal

GeneratorFrequency

Signal InputPoint

BandSwitchSetting

DialSetting Adjust See

Note

AM I -F ALIGNMENT

I 455 kcmodulated 12BE6 grid (pin AM 550 kc

Secondary and primary slugs of T5 for maxi -mum. 3

2 with 400cps

7 of V2) thru.01 mfd.

Secondary and primary slugs of T2 for maxi -mum.

FM DISCRIMINATOR AND I -F ALIGNMENT

3 10.7 un-modulated

Adjust T6 secondary for zero.Apply 1 volt signal input.

4 See adjustcol.

12BA6 grid (pin1 of V3) thru FM

Detune signal generator to point of maximummeter reading. 1

5 Same freq.as in step4

0.1 mfd. Adjust T6 primary for maximum meter read -ing.

6 Adjust slug of T4 for maximum.7

10.7 mc

12B.4.6 grid(pin 1 of VI)thru .01 mfd.

Adjust secondary and primary slugs of T3 formaximum.

2

8 unmodu-lated

12BE6 grid(pin 7 of V2)thru .01 mfd.and 4700 ohms.See note 5.

Adjust secondary and primary slugs of TI formaximum.

2, 5

AM It4 ALIGNMENT

9 1500 kc Inductively Adjust C13 for maximum.10 AM mod-

ulated with400 cps

coupled. Seenote 4.

AM 1500 kc Adjust C9 for maximum while rocking dial. 3, 4, 6.

FM R -F ALIGNMENT

11108 me un-modulated

108 mc Adjust C18 for maximum.2, 6, 7.

12 98 mc un-modulated

Dipole terminals FM For max.output Adjust C11 for maximum while rocking dial. 59

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSALIGNMENT PROCEDURES MODEL 05WG-2752

AM STAGESThe following is required for aligning: Volume Control Maximum all Adjustments.An All Wave Signal Generator Which Will Provide an Accurately Connect Radio Chassis to Ground Post of Signal Generator with a

Calibrated Signal at the Test Frequencies as Listed. Short Heavy Lead.Output Indicating Meter, Non -Metallic Screwdriver, Dummy Antennas Allow Chassis and Signal 0 for to "Heat Up" for Several .

- .1 mf, and 50mmf. Minutes.

SIGNAL GENERATOR

FREQUENCYSETTING

CONNECTGENERATOROUTPUT TO

THROUGHDUMMY

ANTENNA

CONNECTGROUND

TO

GANGCONDENSER

SETTINGADJUST ADJUST

FOR455 KC Control Grid

1st 6BA6 Pin No. 1.1 mf Chassis

BoseRotor Fully Open 2nd I.F. Pri. (1)

and Sec. (2)Maximum

Output455 KC Control Grid

6BE6 Pin No. 71st Det.

.1 mf ChassisBase

Rotor Fully Open 1st I.F. Pri. (3) andSec. (4)

MaximumOutput

455 KC Control Grid6BE6 Pin No. 7

.1 mf ChassisBase

Rotor FullyOpen

2nd I -F Pri. (1)and Sec. (2)

MaximumOutput

1620 KC Control Grid6BE6 Pin No. 7

.1 mf ChassisBase

Rotor Fully Open Oscillator C-41 MaximumOutput

1400 KC ExternalAntenna Lead

50 mmf ChassisBase

Turn Rotor to Max. Output.Set Pointer to 1400 KC

See Note A

Antenna C-2 MaximumOutput

NOTE A-If the pointer is not at 1400 KC on the dial, reset pointer to the 1400 KC mark on the dial 'col.

The followingAn accurately

lated signals

Non-metallic

Dummy

FM STAGESis required for aligning: Zero center scale DC vacuum tube voltmeter having a range of

calibrated signal generator providing unmodu- approximately 3 volts.at the test frequencies listed below. (If a zero center scale meter is not available, a standard scale

vacuum tube voltmeter may be used by reversing the meter connec-screwdriver.tions for negative readings).

Antennas and I -F Loading Resistor -2500 mmf, 300 ohms Allow chassis and signal generator to "Heat Up" for s I minutes.

SIGNAL GENERATOR

FREQUENCYSETTING

CONNECTGENERATOROUTPUT TO

THROUGHDUMMY

ANTENNA

BANDSWITCHSETTING

GANGCONDENSER

SETTINGADJUST

ADJUSTFOR

Discriminator 10.7 MC 6BA6 2nd I -F

Pin 1 and Chassis2500 mmf FM Rotor Fully

OpenDisc. Pri. (5)

Note AMaximumDeflection

10.7 MC 6BA6 2nd I -F


OpenDisc. Sec. (6)

Note BI -F 10.7 MC

Note C6BA6 1st I -F


Open2nd I -F Pri. (7)Sec. (8) Note D

MaximumDeflection

MaximumDiscriminator 10.7 MC 6BA6 1st I -F 2500 mmf FM Rotor Fully Disc. Pri. (5) Deflection

Pin 1 and Chassis Open Note D MaximumI -F 10.7 MC Junction C -32A & B

(Dual 100 mmf cond.)And chassis

2500 mmf FM Rotor FullyOpen

1st I -F Pri. (9)8. Sec. (10)

2nd I -F Pri. (7)& Sec. (8)

Disc. Pri. (5)In Order Shown

Note D

Deflection

10.7 MC Same as above 2500 mmf FM Rotor FullyOpen

Disc. Sec. (6)Note B

MaximumDeflection

RECHECK I -F ADJUSTMENTS IN ORDER GIVEN

Oscillator 108.5 Disconnect built-in dipole an-tenna and connect generatorto dipole terminals with re-sistor in series.

300 ohms FM Rotor FullyOpen

Osc. C-25 MaximumDeflection

Antenna 104.5 Some as above 300 ohms FM Tune rotor formax AVC voltage

Ant. C-39 MaximumDeflection

RECHECK ANTENNA & OSC. ADJUSTMENTS IN ORDER GIVEN

FM ALIGNMENT NOTES NOTE B-Disconnect zero center DC vacuum tube voltmeter fromNOTE A-The zero center scale DC vacuum tube voltmeter is to be AVC and connect it at the audio takeoff point at the

connected between chassis ground and the AVC line. 27 K ohm resistor (R-10) and its junction with the terminalA signal of .1 volt must be fed into the receiver for strip. Adjust for zero voltage indication.this adjustment.Note output voltage on the zero center DC vacuum NOTE C-AM I -F coils must be aligned before attempting to aligntube voltmeter the FM I -F coils.

NOTE D-Connect zero center DC vacuum tube voltmeter as in Note64 A. Adjust input to give same output on the zero center DCvacuum tube voltmeter as in Note A.

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MANUAL OF 1950 MOST-OFTEN-NEEDEDL RADIO DIAGRAMS7" "N

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RADIO84BR-1517A, 1518A

12S Q 7 r51.

35 LOGI35ZIIIIM1115°T I MIL

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ANYEOS:NC.f4 CUP

L.4ALIGNMENT PROCEDURE AND RECEIVER STAGE SENSITIVITIES

The signal source must be an accurately calibratedsignal generator capable of supplying R. F. signalsmodulated 30% with a 400 -cycle audio signal. A 400 -cycle source is necessary for the audio measurement.

The table below lists the sensitivity at various points.All measurements are based on an output of 50 -milli -wafts. This may be measured by disconnecting The

REAR VIEW OF DIAL ASSEMBLY

speaker voice coil and substituting a 3.2 -ohm, 5 -wattresistor across the secondary winding of the output trans-former. A reading of .4 volts AC across this resistorwill be equivalent to a 50-milliwatt output with thespeaker connected. Variations of plus or minus 25% areusually permissable. Volume control at maximum for alladjustments.

SIGNAL GENERATOR

TUNER SETTING ADJUST FORMAXIMUM OUTPUT

INPUT FOR50-MILLIWATT

OUTPUTFrequencyCouplingCapacitor

Connection toRadio

GroundConnection

455 kc. .1 mf. Pin No. 8 of12SA7

12597Pin 3andRotorfull open Trimmers on outputinput I.F. Cain 100 microvolts

1650 kc. .1 mf. Pin No. 8 of12SA7

12SQ7Pin 3

Rotor full open Oscillator trimmer Cl(on bottom)

1400 kc. none See note A noneSet dial at

1400Antenna trimmer C2

(on bottom)

1400 kc. .1 mf. Externalantenna clip

12597Pin 3 1400 kc. 13 microvolts

400 cycles .1 mf. 12S97, Pin 2 12597Pin 3

.05 volts

Not. A: Lay output lead of generator in back of loop antenna.

NOTE: On some sets slug tuned 1. -F.'s are used instead of trim-mer tuned 1. -F.'s. 108-140Q and 108-1451-1 are trimmer tuned.B -13A -12023-I and 8-13B-12022-1 are slug tuned. The slug tuned

121306 12SA7.1 v2

C2

000

MRS 00M0169.,

100

e -

Turn up generator output. Loop antenna will pick up energy.

I. -F.'s are tuned from the top and bottom (secondary on top, pri-mary on bottom).When trimmer tuned I.F.'s are used, R5 is 270 ohms.

128D6V 3

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A A A

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NOTE

50mE SETS WA. 10- 30 MIEat/F.0,11.

351,7t -GT

67

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMONTGOMERY WARDMODELS 84HA1527A

84HA1528A

Intermediate Frequency 455 KC

NOTES -

I. SOCKET VIEWS ARE BOTTOM VIEWS.

2. ALL VOLTAGES ARE MEASURED BETWEEN ME SOCKET TERMINALSAND ELECTRICAL GROUND (NOT CHASSIS) WITH ZERO SIGNAL INPUT.

3. LINE VOLTAGE_II7 V. AC.4. ALL VOLTAGES SHOWN ARE DC UNLESS OTHERWISE SPECIFIED.

AC VOLTAGES SHOWN REDONE DC WHEN OPERATINO FROM A DC LINE.S. DC VOLTAGES SHOWN WERE MEASURED WITH AN ELECTRONIC VOLTMETER

"NO NO CONNECTION. (VOLTAGE SHOWN FOR THIS TERMINAL ONLY WHENTERMINAL IS USED AS A TIE LUG).

7. 'NR'-NOT READABLE. (READING GENERALLY MEANINGLESS).

G. II SPACE PROVIDED FOR SERVICE METER READINGS.

9. ALL READINGS TAKEN WITH LINE PLUG POLARIZED SO THAT GROUND BUSSAND CHASSIS ARE AT THE SAME POTENTIAL WITH THE CHASSIS GROUNDED.

4.

rx

4

......0m011.11111.11.r`

V2

*CAUTION- SEE NOTE 9.

TUBE SOCKET VOLTAGE CHART

V3

FRONT APRON

V4 V5

68

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L°

g3

4

V21251(7

6

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2.2 MEG.

V31 2 5 07

47,000 T100MMF

I

100 MMF

105 10,000 500,000 .005

V, V2 V3 V4 V5

7 2 7 7 B 2 7 7

G47

3

NOTE- RESISTOR VALUES ARE IN OHMS.ALL RESISTORS ARE I/2W. UNLESS OTHERWISE SPECIFIED.CAPACITOR VALUES ARE IN MFD. UNLESS OTHERWISE SPECIFIED.

4- INDICATES ELECTRICAL GROUND

nin INDICATES CHASSIS GROUND

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ALIGNMENT

If AC power is used, use an isolation trans-former between power line and receiver. If isola-tion transformer is not available, connect low sideof signal generator to B- through .1 mf capacitor.

Connect low range output meter across speakervoice coil and set volume control at maximum. Forgreatest accuracy, keep output of receiver at ap-proximately .05 watt (.05 watt = .40 volt on out-put meter) throughout alignment by reducing signalgenerator output as stages are brought into align-ment. Use a small fibre screwdriver for aligningIF & diode transformers.

CHASSISHS -I67

59RI5G59RI6Y

MODELS59RII

59RI2159RI3M59RI4E

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TUBE & TRIMMER LOCATION

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GENERATORFREQUENCY

POINTERSET TO ADJUST REMARKS

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tuning cap opened 4

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n n1620 Kc a

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3. None Radiation loop* 1400 Kc Tune formaximum

6 Adjust for maximum.

Connect generator output to 5" diameter, 3 turn loop & couple to receiver loop. Keep loops at least 12"apart.

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RECORDSPINDLE

(FOR SMALLHOLE RECORDS)

RECORD SUPPORTRELEASE

RECORD

RECORDSUPPORT

PICK-UPARM

To adjust the RECORD SUPPORT, press down on the RECORD SUPPORT RELEASE andmove the record support to the desired position.

FIGURE 1. RECORD SUPPORT ADJUSTMENT

PHONOGRAPH CONTROLS OPERATION

RECORDCHANGER

MODELRC -36

SPEED. The SPEED control determines the speed at which the turntable revolves. You must set this control tothe position corresponding to the playing speed of the records you wish to play, viz., record speed 33 RPM, SPEED control to33; record speed 45 RPM (large center -hole records), SPEED control to 45; or record speed 78 RPM, SPEED control to 78.

CAUTION: The SPEED control can only be moved clockwise from a playing speed position, but may he movedcounterclockwise or clockwise, one position, from an OFF position. To stop turntable - rotateSPEED control clockwise.

REJECT. The REJECT control is momentarily turned clockwise and released to start playing action or to reject arecord before it has completely played.

OPERATING PROCEDURE

1. Turn the radio power switch "on" and the phono-radio control to the. -phono" position.

2. Select the appropriate center post for the records you desire to play.

a. Two spindles are provided; one spindle for small -hole records and one for large -hole records.

b. To play small center -hole records, insert the small diameter spindle into the hole in the center of theturntable and rotate the spindle until the pin of the spindle drops into the slot in the turntable bushing.

c. To play large center -hole records, insert the large diameter spindle into the turntable hole and turn thespindle counterclockwise until the spindle reaches a stop. NOTE: If the two metal separator discs of thelarge spindle are seen protruding from the spindle, turn the spindle shaft until they disappear inside thespindle, then insert the spindle into the turntable.

d. To remove a spindle from the turntable, merely lift the spindle straight up from the turntable.

3. Adjust the RECORD SUPPORT to the correct position according to the size record you desire to play.

a. Three positions of the record support are provided, i.e., a separate position for playing 7 -inch, 10 -inch,and 12 -inch records (see Figure 2).

b. To adjust the RECORD SUPPORT press down on the RECORD SUPPORT RELEASE and move the RECORD SUPPORT to thecorrect position according to the size records being played. The RECORD SUPPORT will lock in position(see Figure 1). NOTE: Although the ledge of the RECORD SUPPORT is not used when playing 7 -inch 45 RPMrecords, the RECORD SUPPORT must he in the 7 -inch playing position.

4. Load the records.

a. Raise the RECORD CLAMP to a'vertical position.

h. Place a stack of records over the center post in the desired sequence, with the last record to be playedon top.

c. Rest the records on the ledge of the RECORD SUPPORT and on the off -set of the spindle when playingsmall -hole records. If you are playing large -hole records, place the records over the spindle and rest 11

them on the off -sets of the large spindle.

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMOTOROLA Record Changer Model RC -36, continuedd. Gently lower the RECORD CLAMP on the records. NOTE: DO NOT LOWER THE RECORD CLAMP WHEN PLAYING 7 -INCH

45 RPM RECORDS.

5. Adjust the SPEED control to the position corresponding to the record speed of the records you are playing.

6. Momentarily turn the REJECT control clockwise.

a. The bottom record will now drop to the turntable, the pick-up arm will lift, swing in, and drop to theturntable; record playing will now begin.

b. The REJECT control may be turned momentarily clockwise to reject a record before it has completelyplayed. NOTE: Never touch the pick-up arm while the record changer is in a changing cycle.

7. At the conclusion of playing and as the last record is being repeated, lift the pick-up arm and move itto the right.

8. Turn the SPEED control clockwise to the OFF position. NOTE: This stops the turntable, but the motor willcontinue to run until turned off either with the "phono" control or "power" switch on the radio panel.

9. Turn the power switch on the radio panel "off".

TO UNLOAD RECORDS

82

1. Raise the RECORD CLAMP.

2. Lift the records straight up from the turntable. Do not apply pressure to the top record. Keep your thumbsfree. NOTE: When removing 45 RPM records, if the two metal separator discs of the large spindle are seenprotruding from the spindle, lift the spindle, with the records, from the turntable and turn the spindleshaft until the discs disappear inside the holder before removing records.

A. To play 7 -inch small -hole records,press down on the RECORD SUPPORT RE-LEASE and move the RECORD SUPPORT tothe extreme outward position. Rest therecords on the ledge of the RECORD SUP-PORT and on the off -set of the small

spindle.

C. T6 play 12 -inch records, press downon the RECORD SUPPORT RELEASE and movethe RECORD SUPPORT to the extreme in-ward position. Rest the records on theledge of the RECORD SUPPORT and on theoff -set of the small spindle.

B. To play 10 -inch records, press downon the RECORD SUPPORT RELEASE and movethe RECORD SUPPORT to the middle posi-tion (1-1/2 inches in from the extremeoutward position). Rest the records onthe ledge of the RECORD SUPPORT and onthe off -set of the small spindle.

D. To play 7 -inch large -hole records,press down on the RECORD SUPPORT RE -TEASE and move the RECORD SUPPORT tothe extreme outward position. Restthe records on the off -set of the

large spindle.

FIGURE 2. RECORD SUPPORT IN RECORD PLAYING POSITIONS

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MOTOROLA Record ChangerModel RC -36, continued

60C

60

60A

608RECORDPUSH -OFF

ADJ.

63

218

2 C 22

64

64A

71

9 9A

33

21H

24C

216//-21

21A

-1A

/1166

116A 118 117

82-\

32PICK-UP ARM HEIGHT ADJ(ACCESSIBLE THROUGH

HOLE IN REAR)

FIGURE 5. VIEW OF RECORD CHANGER WITH BASE & MOTOR ASSEMBLY REMOVED

210 21E 21F

111111F

21B

21C22.

84

134

-4

-19

608PsRECORD PUSH -OFF

ADJ

FIGURE 4. BOTTOM VIEW OF RECORD CHANGER

UNDER SIDEVIEW OF 60C

ASSEMBLY 36B TRIP ARM ADJ

608 36RECORD PUSH -OFF ADJ - 33

"--' 36A4

28

11-28A

21H-28B

11- r27--/

36C21G

21

120

117

_48

24B

24C 67 648

FIGURE 6. DISASSEMBLED VIEW OF RECORD CHANGER MECHANISM

24A

24

121

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMOTOROLA. Record Changer Model RC -36, continued

(64A) thus permitting it to drop to the turntable. At this same time, the restoring lever (21G) lowers the set -down flag (24C)

(which will index the pick-up arm when the slide channel makes its forward motion) also the trip slide cocking stud (6) en-

gages the trip arm (21C) with the trip flag (21B) to set it forcthe next cycle and to prevent re -cycling when the slide chan-

nel completes its cycle. At this point one-half of the change cycle is completed.

The cycle gear (9) will continue to rotate until it completes one revolution. As it continues to revolve, the

slide channel (21) will move forward and the clutch fingers (21F) that are still engaging the set-down arm assembly (36) will

now swing the pick-up arm tsIck toward the record spindle until the set -down arm (36C) contacts the set -down flag (24C); this

controls the pick-up arm set -down point. While the arm is being held over the set -down point by (24C), continued rotation ofthe cycle gear (9) makes the pick-up arm shaft (33) ride down the incline (21D), lowering the pick-up arm onto the record.

As the slide channel (21) approaches the end of the cycle (fully forward position) the set -down flag (24C) is moved

out of the way by the restoring lever (21H) to give the pick-up arm complete freedom of movement during playing of the records.

When the slide channel moves fully forward, the drive clutch lever (118) rides up the trip lever incline (21A) and

disengages the drive clutch lever dog (1188) from the drive dog screw (120) in the turntable, thus ending the cycle.

PICK-UP ARM SET -DOWN POINT

The point at which the pick-up arm drops to the turntable for either 7 -inch, 10 -inch or12 -inch records is deter-

mined by the position of the set -down flag (24C).

When the record support assembly (64) is adjusted for a specific size record, the movement of the record support

causes rotation of the gear and pinion shaft assembly (60A) through the rack gear (64B) on the record support. Since the gear

and pinion shaft assembly (60A) engages the set -down gear (280 and the set -down cam (28A) is attached to the set -down gear,

any movement of the record support will cause the set -down cam to turn. The set -down cam stud (24B), on the slide plate and

spring assembly (24A), rides with the set -down cam due to the tension of the slide plate spring (27); therefore, any action of

the set -down cam will affect the position of the set -down flag (24C).

45 RPM RECORD DROP

The 45 RPM spindle shaft, when dropped in the turntable center hole, fits into the slot in the tiling stop (14).

When the change cycle begins and the slide channel (21) is making its backward movement, the reject plate (16)

moves forward due to the eccentric form of the drop cam (11) riding on roller (16A) and the tension of the spring (17), pulls

the reject plate (16) forward until it contacts timing stop (14), preventing it from rotating. Since the turntable with the

45 RPM spindle continues to rotate and the timing stop (14) and spindle shaft (153) remain stationary, the two pinion gears

(155) in the upper section of the spindle rotate around the spindle shaft (153) gear. The eccentric extending from the upper

end of the two pinion gears (155) runs in a slot in the molded record supports to produce the necessary action which causes

the supports to move in against the tension of spring (156). As the plastic record supports recede, the separator discs

mounted above each record support separate the lower record of the stack and support the remaining stack while the lower record

drops to the turntable. With continued rotation of the spindle the record supports, due to the action of spring (156), will

move out to support the record stack, while the separator discs recede into the spindle.

When the slide channel (21) is making its forward movement, the reject plate (16) moves back releasing the timing

stop (14) allowing the timing stop and the spindle shaft to revolve for the playing of the record.

83

87-.0

a

109

87A

92

82COMPLETEASSEMBLY

FIGURE 7. MOTOR & SPEED CHANGING ASSEMBLY

85

maw

auraormal 11H

OD

IVII3 C

DIO

OM

I'9 nomA

lOPOSSV

3131dWOO

3131d14100,1/4191413SSV

88

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMOTOROLA Record Changer Model RC -36, continued

ADJUSTMENTSNEEDLE SET -DOWN ADJUSTMENT

A template, (Motorola Part No. 54B792330) furnished with the record changer, is required to index the needle to thecorrect set -down point after a needle or cartridge has been replaced. If a template is not available, you may improvise oneas follows:

1. Set a compass to 3-5/16 inches and draw a circle on a piece of cardboard.

2. Punch out a 17/64 inch diameter hole at the exact center of the circle.

To index the needle to the correct set -down point:

1. Place the small diameter spindle in the turntable and the template over the spindle.

2. Move the record support to the 7 -inch record playing position. NOTE: When the needle is set correctly forthis position, the index will be automatically set for 10 -inch and 12 -inch records.

3. Rotate the turntable by hand and turn the reject control to start the change cycle. Watch the needle carefully.It must land on the curved line of the template.

4. If the needle does not land on the line, adjust the set -down setscrew (53) located on the pick-up arm (seeFigure 11). Turn the setscrew clockwise to move the pick-up arm in a direction towards the spindle, or turnthe setscrew counterclockwise to move the pick-up arm in a direction away from the spindle. IMPORTANT: Turnthe screw very slightly and repeat step 3. Repeat this procedure until the needle lands exactly on thecurved line.

PICK-UP ARM HEIGHT ADJUSTMENT

If the pick-up arm strikes the bottom record of a stack of records resting on the 45 RPM spindle or the pick-up armdoes not rise sufficiently to clear a 1-inchstackof records after they have dropped to the turntable, proceed as follows:

1. Remove the cabinet back or remove the record changer from the cabinet, as required, to gain access to therear of the record changer.

2. The height adjustment screw (32) is accessible through a hole in the rear of the record support housing (138)(see Figure 3).

3. If insufficient clearance is noted, turn the height adjustment screw (32) clockwise to raise the arm, orcounterclockwise to lower the arm, as required.

PUSH -OFF LEVER ADJUSTMENT

If a record fails to drop to the turntable, check the position of the record push -off lever (71) on the record sup-port during a change cycle; it should protrude a minimum of 1/32 inch from the record support during the record dropping por-tion of change cycle. If adjustment is required, proceed as follows:

1. Remove the cabinet back or remove the record changer from the cabinet, as required, to gain access to the rearof the record changer.

2. Turn the reject knob to place changer in cycle and rotate turntable by hand until record push -off lever (71) isat its point of maximum forward travel.

3. Turn the push -off adjustment screw (60B) until push -off lever (71) protrudes 1/32 inch beyond lip (64A) ofrecord support.

TURNTABLE DRIVE PIN ADJUSTMENT

If a "clicking" noise is heard while a record is playing, the drive dog adjusting screw (120) on the bottom of theturntable is touching the drive dog (118B). To remedy:

1. Remove the turntable. NOTE: Do not remove the drive clutch lever (118); also do not lose the bearingwasher (115).

2. Loosen the hex nut (121) and turn the drive dog adjusting screw (120) counterclockwise to bring the screwfurther away from the drive dog. CAUTION: Do not turn the screw too much, since the screw will not engagethe drive dog and, as a consequence, the changer will fail to cycle.

3. Tighten the hex nut (121).

TRIP ARM ADJUSTMENT

If the mechanism does not trip after playing a record or trips before a record has completed its play, the set -down arm (36) requires adjustment.

1. Readjust the needle set -down setscrew (53) (see paragraph on NEEDLE SET -DOWN ADJUSTMENT).

2. If adjusting the setscrew in step 1 does not correct the fault, remove the cabinet back or remove the recordchanger from the cabinet, as required, to gain access to the rear of the record changer.

3. Turn the set -down adjustment screw (53) until the end of the setscrew is even with the pick-up arm.

4. Adjust the trip arm adjustment stud (36B) (this is an eccentric stud) sufficiently so that mechanism tripscorrectly.

5. Readjust the needle set -down setscrew (53) (see paragraph on NEEDLE SET -DOWN ADJUSTMENT).

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMotorola Record Changer Model RC -36, continued

PARTS REMOVAL AND REPLACEMENTNEEDLE REPLACEMENT

Use only a Motorola needle; do not use any other needle, as damage to the records or crystal cartridge will re-sult. IMPORTANT: After needle is replaced, check the set -down point as outlined in NEEDLE SET -DOWN ADJUSTMENT.

Two types of needles and crystal cartridges are being used. Look at your needle and cartridge:

IMPORTANT: The needle should be held in the cartridge perpendicular to the surface of the turntable.

1. If the needle is secured to the cartridge with a small, round knurled nut (see Figure 9), loosen the nut andremove the needle from the cartridge. Replace with Motorola needle, Part No. 591(691908. Insert the replace-ment needle in the cartridge needle receptacle and tighten the knurled nut.

2. If the needle is not held in place with a knurled nut, merely pull the needle from the cartridge using yourfingers or pliers (see Figure 10). Replace with Motorola needle, Part No. 591(691909. The replacement needleis partly encased in a small guard to protect the needle point; push the needle into the cartridge needle re-ceptacle and remove the guard. Friction will hold the needle in position.

FIGURE 9.

CARTRIDGE REPLACEMENT

FIGURE 10.

PICK-UPARM

SET -DOWN ADJUSTMENT SETSCREWTURN SCREW PTO MOVE PICK-UP ARM FROM SPINDLETURN SCREW -. TO MOVE PICK-UP ARM TSar"2S SPINDLE

FIGURE 11.

Two types of cartridges are being used, they are interchangeable. To remove the cartridge, merely remove the cart-ridge retainer clip (48) and disconnect the pick-up leads. IMPORTANT: After cartridge is replaced, check the needle set -downpoint as outlined in NEEDLE SET -DOWN ADJUSTMENT paragraph.

TO REMOVE THE TURNTABLE

1. Remove the turntable retaining clip.

2. Lift the turntable straight up from the base plate. Be sure the bearing (116) and bearing washer (115) donot get lost or dirty.

3. When replacing the turntable, it will be necessary to center the drive clutch lever (118) and bearing washer(115) to allow proper seating of the turntable over the spindle post.

4. Replace the turntable retaining clip.

TO REPLACE THE DRIVE CLUTCH LEVER

1. Place the changer mechanism in the rest position (slide channel (21) in full forward position) with the tripflag bracket (21B) engaged in the trip lever arm (21C).

2. Place the drive clutch lever (118) in position with the weighted end (118A) of the drive dog resting on thetrip lever (21A).

TO REMOVE THE DRIVE GEAR

1. Remove the turntable and drive clutch lever (118).

2. Lift the drive gear (117) straight up from the spindle post.

3. When replacing the drive gear (117) it is important that the changer be timed correctly. To time, positioncycle gear so that cycle gear roller (9A) is directly in line with the spindle post (1A) and pull the triplever (21A) forward so that trip flag (21B) falls in and locks it in position. Now place the drive clutchlever (118) in position on drive gear (117) and mesh the gears so that weighted end of clutch lever (118)rests on the lowest edge of the trip lever (21A) incline. Check the timing by playing a stack of 45 RPM re-cords. If a record of the stack fails to drop during a cycle, move the drive gear (117) one "tooth" and playanother stack of records to again check the timing.

TO REMOVE THE MOTOR ASSEMBLY

1. Disconnect the power lead.

2. Remove one machine screw (131) from the bottom of the record changer securing the motor assembly to thebase plate.

3. Remove the turntable from the record changer.

4. Remove the two machine screws (114) securing the motor assembly to the changer mechanism.

5 Remove the speed control knob. 89

90

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMOTOROLA Record Changer Model RC -36, continued

PICK-UP ARM MOUNTING PLATE ASSEMBLY REPLACEMENT

Should it ever become necessary to remove the pick-up arm mounting plate assembly (24), the following precautionsshould be observed when replacing the assembly.

1. Be sure that the hole in the set -down cam (28A) lines up with the hole in the mounting plate and that theset -down cam stud (24B) on the set -down flag (24C) is on the outside of the cam.

2. Be sure that the set -down flag (24C) is in a position so that it can be actuated by the restoring lever (21G).

3. The record support must be in the 12 -inch playing position when replaced.

TO REMOVE THE SLIDE HINGE AND SLIDE BRACKET

1. Slide hinge (145) is secured with a spring clip (149). To unlatch the slide hinge: Place a folded piece ofpaper on both sides of the slide hinge, between the elide hinge and the slide cover (143) and pull the paperforward, simultaneously pulling the slide hinge upwards. See Figure 12.

2. Four machine screws secure the slide bracket (146) to the record support and slide cover (143).

SERVICE HINTS

STANDARD OR 33 RPM RECORDS FAIL TO DROP

1. Adjust the push -off lever (71), or -

2. Record center -hole binding on spindle. Ream outwith pencil. motor shaft revolves, or -

45 RPM RECORDS FAIL TO DROP

1. Drive gear (117) does not mesh with cycle gear(9) correctly.

PICK-UP ARM DOES NOT SET DOWN IN CORRECT POSITION

1. Adjust the set -down setscrew (53).

MECHANISM TRIPS BEFORE RECORD IS COMPLETED, OR DOES NOTTRIP AFTER RECORD IS COMPLETED

1. Adjust set -down setscrew (53) and the trip armstud (36B).

CONTINUOUS CYCLING

1. Drive clutch lever (118) 1800 out of phase;merely reverse the drive clutch lever's positionon the drive gear (117), or -

2. Grease or dirt on trip flag bracket (21B), or -

3. Set -down flag (24C) not being actuated by re-storing lever (21G), or -

4. Turntable bearing (116) or bearing washers (115)missing.

MECHANISM FAILS TO TRIP WREN REJECT BUTTON IS TURNED

1. Reject rod (134) not connected, or -

2. Trip lever spring (22) weak or not connected.

MECHANISM SLOW IN STARTING

1. Bad motor, or -

2. Grease on idler wheel (109) or on speed controlpulleys (95, 96 or 97), or -

Parts binding.

TURNTABLE DOES NOT REVOLVE

1. Check the power to the motor, or -

2. Remove the turntable and check to see if the

3. Bed motor, or -

4. Grease on the idler wheel (109) or on speed con-trol pulleys (95, 96 or 97), or -

5. Turntable not seated properly.

NEEDLE JUMPS GROOVES

1. Record changer not level, or -

2. Records dirty - clean with soap and water, or -

3. Needle not set correctly in the cartridge - itshould be perpendicular to surface of the record.

5T/FF PAPER/V5/1 ro w,4,e0 roRELEASE CL/P

RECORO JUPPoRTRELEASE

145SPR/AIG CLIP

/49

FIGURE 12. METHOD OF RELEASING CLIP ON RECORD SUPPORT RELEASE


MODEL 309

Universal auto receiver forunder dash mounting. Model 400receiver is similar but usesminiture tubes as indicated inthe chart below:

FUNCTION 309 400

R.F. AmplifierOscillatorI.F. AmplifierDet.-Audio Amp.Power AmplifierRectifier

6SK7GT6SA7GT6SK7GT6SQ7GT6V6GT6X5GT

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91

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSMotorola Auto Radio Model CT10for 1950 Chevrolet. Model CT9used in 1949 Chevrolet is verysimilar, but uses a 6V6GT poweramplifier instead of a 6Aq5.

IF (SEC)455KC

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MANUAL."

TUNING TUNERCONTROL CARRIAGE

POINTERADJUSTMENTECCENTRIC

SET TUNER CARRIAGE TO 3/16 OF ITSMAXIMUM TRAVEL POINT FOR 14256C. BATSET TUNER CARRIAGE TO I-1/32" OF ITSMAXIMUM TRAVEL POINT FOR OSC. PAD. ADJ.

RETURN

TO SET THE PUSH BUTTONS

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AUDIORECEPTACLE

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will result in poor tone quality. Release button2. Push the top button in as far as it will go and and knob after tuning -in the station.HOLD IT THAT WAY.

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ARVIN RADIOS - MODELS 341TCHASSIS RE -274 4 TUBE AC -DC

MANUFACTURED BY NOBLITT-SPARKS INDUSTRIES, Inc., COLUMBUS, IND.

ALIGNMENT PROCEDURE

PRELIMINARY:Output meter connection AcrossOutput meter reading to indicate 200 milliwatts (standard output)Dummy antenna to be in series with signal generator outputConnection of generator ground leadGenerator modulationPosition of Volume ControlPosition of pointer with variable fully closed

loudspeaker voice coil0.8 volts

See chart belowFloating ground30% 400 cycles

Fully clockwise54 on dial

Position Generator Dummy Generator Trimmers Trimmer Approximateof Frequency Antenna Output Adjuster Function Sensitivity

Variable ConnectionOpen 455 Kc .05 uf 12SA7 Grid

(Stator of C-1)2 trimmerson top of T-3

IF 3000 uv

1400 Kc 1400 Kc .00005 uf Antenna lugwith Ant. Removed

4*C-2 Oscillator 360 uv

"Since the antenna section of the variable has no trimmer, the rotor of the variable should be rocked back and forthon both sides of 1400 Kc while adjusting the oscillator trimmer for maximum output. This is to obtain the combinationof rotor and trimmer setting to give perfect tracking of the two sections of the variable condenser and consequentlygive maximum output.Check sensitivity at 600 Kc. If weak, adjust antenna section plates for maximum output at 600 Kc. Tracking of thecondenser at points other than 1400 Kc is accomplished by bending the outside plates on the variable condenser rotor,which are cut for this purpose. When bending plates to track the condenser at any given frequency, keep in mind thefact that this will affect the tracking at all frequencies below the point where the plates are bent. A tuning wand isvery helpful in checking the 'tracking of this condenser, to indicate whether more or less capacity is needed.The alignment procedure should be repeated stage by stage in the original order for greatest accuracy.Always keep the output from the test oscillator at its lowest possible value to make the AVC action of the receiverineffective.

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ARVIN RADIO Models 360TFM and 361TFM, Chassis RE -260

ALIGNMENTAM

1. Plug set into 117 V. power source, turn volume controlfull on and band switch to AM, (left).

2. Connect output meter across speaker voice coil.:3. Connect signal generator high side through .05 mfd.

condenser to converter grid and generator ground leadto receiver floating ground. Open tuning condenser.ator to test loop. Set signal generator to 1650 Kc.Tune trimmer A5 on oscillator section of tuning con-denser or maximum output.

4. Close tuning condenser and set pointer at end mark ofdial. Open tuning condenser. Connect signal gener-ator to 1650 Kc. Tune trimmer A5 on oscillator sectionof tuning condenser for maximum output.

5. Set signal generator to 1400 Kc. Adjust tuning shaftuntil maximum output is obtained. Tune antennatrimmer A6 on tuning condenser for greatest output.Reset tuning shaft until output is again a maximum.Retune antenna trimmer. Repeat this cycle of opera-tions at 1400 Kc until no further increase of outputcan he obtained. Keep generator output at a lowvalue to prevent detuning by A. V. C. action.

6. Set signal generator to 600 Kc. Adjust tuning shaftfor maximum output. Adjust tuning condenser platesfor maximum output.

7. Check sensitivity at 1000 Kc. If sensitivity is too low,tuning condenser plates can be adjusted for tracking atthis frequency. If this adjustment is made, tracking at600 Kc must he readjusted.

8. Check coverage and calibration after alignment.Coverage should include 535 and 1650 Kc. Calibrationshould be such that pointer covers some part of calibra-tion mark. If coverage and/or calibration are notcorrect, plates of tuning condenser can be adjusted.Calibration check points are 14(X) 1000 6(X) and 540Kc. If oscillator plates are adjusted, tracking ofantenna section must be rechecked and corrected ifnecessary.

9. Check setting of trimmers on tuning condenser. Trim-mer adjustments must not be extremely tight nor soloose as to be noisy or vibrate.

10. After alignment, check for noise due to condenser platestouching or pointer touching dial as tuning shaft isturned through the full tuning range.

11. The sensitivity of this set should be approximately 5(X)uv/m with 400 cycles, 30% modulation and 200 milli-watts, (.8 volt output.

FM1. Turn hand switch to FM, (right).2. Connect (FM) I.F. generator to the second 12BA6 I.F.

amp. grid, (lug #I) through the .01 of mica dummy.

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FIG. I.

PROCEDUREConnect oscilloscope across volume control. With150 Kc deviation 10.7 on the I. F. generator andthe same audio voltage used as horizontal sweepon the scope, adjust the ratio detector transformer slugsA7 -A8 for the characteristic "S" curve (See Fig. 1),with maximum vertical height on the scope. Afterthis adjustment the too slug of the ratio detector shouldnot be moved during the rest of the alignment.

3. Connect I.F. generator to mixer grid through .01 micadummy. Using 23 Ke deviation 10.7 Mc adjust10.7 Mc I. F. transformer slugs A9, A10, All andAl2 for maximum output. Maximum output may beindicated by maximum vertical height on the scope ormaximum voltage on a standard output meter acrossthe voice coil of the receiver. After the two I.F. trans-formers have been aligned the bottom slug A8 of theratio detector should also be peaked.The characteristic "S" curve of the complete I.F.channel should he checked by applying a 10.7 Mcsignal with 150 Kc deviation to the mixer grid andobserving the "S" curve on the scope. It shouldnot be very much different from that observed in step 2.

4. Connect R.F. (FM) generator (88 to 108 Mc) to theantenna terminals through the standard 300 ohmdummy (150 ohm in each side of generator leads). UseR.F.generator with 23 Kc deviation. With the variablecondenser completely open and S.C. tuned to 108.5 Mcadjust. oscillator trimmer A13 small ceramic trimmer)for maximum reading on output meter.Then tune receiver to low end of hand (variable com-pletely closed) and S.G. to 87.5 Mc. If the receiverdoes not tune to this frequency the FM oscillator coilL4 will either have to be squeezed together or length-ened to cover the hand, (squeezing lowers and lengthen-ing raises the frequency). Any change in the coil willhave to be compensated by the trimmer at the high endof the hand.

5. With the same S.C. connections as per paragraph 4tune S.G. and set to 105 Mc. Tune R.F. trimmer .414for maximum output at the same time rock variableback and forth through the frequency. (Rocking isnecessary because slight oscillator pulling causes er-roneous maximum readings).Tune S.G. and set the 90 Mc. Adjust R.F, coil L3length for maximum output by squeezing or lengthen-ing. Any change in the coil will have to be compen-sated at 105 Mc by the R.F. trimmer A14.

6. After steps 4 and 5 are finished check calibration andhand coverage. Steps 4 and 5 may have to be repeatedif set is off calibration. Band coverage should be 87.5Mc to 108.5 Mc. SensitiVity should be approximately200 uv at 105 Mc, 98 Mc and 90 Mc.

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For rapid trouble shooting, the radio circuit is dividedinto far sections, wnh test points specified for each section;these mrtions and test points arc indicated in the schematicdiagram. The troubleshooting procedure given for eachsection includes a simplified test chart and a Imam viewof the chassis showing the lootions of the test points andthe components of that section.

MANUAL OF 1950 MOST -OFTEN-NEEDED RADIO DIAGRAMSPHILCO RADIO MODELS S0-522, 50-522-I and 50-524

Philco TROUBLE -SHOOTING ProcedurePreliminary Checks

To avoid possible damage to the tadie, the followingpreliminary checks should be made before it is turned on:

I. Inspect both the top and bottom of the chassis. Makesure that an tuba are secure in the proper sockets, endlook for any broken or shorted connections, burned resistors,or other obvious indications of trouble.

In each chart, the first step is a master Nati fordetermining whether trouble exists M that section withoutgoing through the entire ECM procedure.

Failure to obtain the "NORMAL INDICATION" inany given step indicates trouble within the circuit undermt.

2. Measure the resistance between B+ (test point C)and B- (test point B). See figure 1. When the ohm-meter tem leads are connected in the proper polarity, thehighest resistance reading will be obtained. If the readingis lower than 1500 ohms, check condensers CI OIA, CIOIE,CIOIC, and C203 for leakage or shorts. The resistancevalue given is much lower than normal, and is not intendedas quality check of these condensers: the value givenis the lowest at which the rectifier will operate safelywhile the voltage checks of Section 1 (power supply) areperformed.

Section I -Power SupplyFor the tests in this section, use a

d -c voltmeter. Connect the negativelead to B-, test point B; connect thepositive lead to the test points indicatedin the chart The voltage readingsgiven were taken with a 20,000 -cans -revolt meter at a line voltage of 117volts, ad.

Turn on the power, and sec the volurne control to minimum.

If the "NORMAL INDICATION"is obtained in step 1, proceed withthe tests for Section 2 (audio circuits);if not. imlate and correct the troublein this section.

TROUBLE SHOOTING

m arcr Airalt. ....11114, ,MISSEND CAUSE OF AINIONNAL INDICATION

fa wogs Trouble in uto oration Isolate be the following ens.130 mho No voltem Detective: 35ZSGT.

Open: WI00, 5100.Shorted: C100, GIOIA.

Low vidooe Defective: =SOT.Open: GIOIA.Leek, CIDIA.

High voltege Open: R101II 118 volts " v*"."

17tedi,T1k 0.L'" "'""

?If:rTrIT2'CtiLea,: C10113.

U4hovolts

re tined' 7 'C'1. TC 70.m.. 'n ': "R.10. 2.vonLow voltam Leek,: CIOC.

Omn: IOIC.

Hien voltam Open: Mao.Li,. , era inert.. hunk me, eamed by opC1D1A, 01B, or C1010.. Thin n -n looted i another section, m y use abnormal i dicedon in this metion.

Section 2 -Audio Circuits

For the tea M this section, use anaudio -frequency signal generator. Con-nect the generator grand lead ro 8-,at point 13; connect the output leadthrough a condenser to the tempoints indicated in the chart.

Set the volume control co maximum.If the "NORMAL INDICATION"

is obtained in step I, proceed with thetea for Sections 3 (i-f, detector. anda -v, Oro ls), if na, isolate and cor-rect the trouble in this section.

TROUBLE SHOOTING

TrsrAI

NOINEAL INDICATION POSSIELE CAUSE Of 4NONDIAL OUNCATIONLoud, glen meeker outout with

week atonal in t.folioby.

C ... output vii mmlinput.

mote Mg- more: SOL . 200.Open: R204, T200.Sleeted: C202, C303.

8 Same as step 1. Defective: laBb (triede section,.Om.: 0201, 8202,11203.Shorted: 1:201.

A Some as cup I. Open: 11100 Irma Mewed. renoel, 0200, 8201.Smiled: C30101.

This wit, bested in nosh r metion, may tome abnormal indiemion in Shia aerate..

Section 3-I.F, Detector. and A -V -C Circuits TROUBLE SHOOTINGFor the tests in this ction, use an

r -f signal generator, witseh modulatedoutput, se at.

toat 455 Itc. Connect the

mnerator ground lead B-, tellpoint B; t the ourput leadthrough a .1 -of. condenser to the restpoints indicated in the chary,

Set the volume control to maximum,and turn the tuning control until the

condenser is fully meshed.If the "NORMAL INDICATION"

is obtained in step 1, proceed with theme for Section 4 (r.f and convertercircuits); if not, isolate and correctthe trouble in this section.

To provide a complete i-f-amplifier check, ten point A for dais section is placed at the grid of the mixer in Section 4Therefore, the cards enee of step I as a master check is dependent upon the condition of certain parts in the mixer circuitThese parts are listed below under "POSSIBLE CAUSE OF ABNORMAL INDICATION-

!!Memo 3. Semen elm, Shea.. Seale* 3 Tint hats

rnsTA

POI NOIIAL INDICAION resents CAUSE Or ANOMIE. INDCATIONLoud, elmrN spoke, OTut, with

week Mond nput.Trouble in this section. Imlate by the followIing ie..

2 I: Loud, clear output with moderateinput

Defective: 121141, 14116. laliode 09.0onl .Misaligned: 7.301.

'Iri'Zterl'n'U',Tit4,(,:."e6 5,-."&V,To,`,""' 555"'A Sam m swo 1. Defemive: 7A/01.

Misaligned: 0300.Open: 1,00A, 1-10011, H201. CHM, 1,0011.Shorted: C3004, COO. C400A. ria parr, looted in moth r may muse abnormal all Non in this metion.

Section 4-R.F mod Converter CircuitsFor the tea in this section, with

the exception of the oscillator test, usean r -f signal generator with modulated

Connect the generator groundlead 8-, test point B; connect theoutput lead through a .1ot, condenmrto test points indicated in thechart.

Set the volume control to maximum.Set the tuning control and the signal.generator frequency as indicated in thechart.

If the "NORMAL INDICATION"is not obtained in step I, isolate andcorrect the trouble in this section. Ifthe trouble is not revealed by the restsfor this section, check the alignment.

TROUBLE SHOOTING

Mare 1. Seine- Yew. Shade. Seel.. Test Pelee

tor nor retort teiultfre NONA.

INDICATION POSSIELE sectsr ABNORMAL INDICATION1000 1000 lac. Lood,elear meeker

put with wokeigmel MpuL

Treuble in dmion. Isola by the follow.ino e:u,

2

Ore. met:note I.

Tunethroughmu..

Negative 4.1 to 7.5volts.

Defective: lAILOpen: Cael, TWO, 11500.Shorted: TOO, COL C100, COMM. CVO.

A 1000 /ie. 1000 ke. Seine es cep 1. Defective: 7A8.Op,LA400.Shorted: C400, C400A, 1.6400.

rr.SCILLAT11fl TEST:1:147;,..1.3.m.p,,ti.lice bed. of re,. it;ttaz.e.t pin 11 f

g 'wit es 0-10 volts. Pm,. mood ."2.1=111. or is indicated 17n:wive voll47; apeoeinaelY the value ssr chart I maimed with 2 ,000.ohmommv II meter,. Meath*m the tuning range. en n

SECTION 4RF AND CONVERTER CIRCUITS

CONVERTERA00

Pima S. Phlle. gale Ideals 50.523, 54522.0..N 50.521.Seattimellea Seltenione Oliarten. Seale, Test rel.

SECTION 3IF, DECTECTOR,AND AVC CIRCUITS

2200rC100A Tc.17

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SECTION 2AUDIO CIRCUITS

0202

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22

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EMED

COMEN5E0 SYMBOLS

VARIABLE HIPPER 0.9[1000,11(iii

0011.1901/HAW COVE

ALL RESISTOR VALUES M Cla UNLESS MARKED OTHCRent

ALL CONDENSER VALUES IN RITE UNLESS MARKED OPIERWISE

102 MOICATES LESS THAN IOHM

PHILCO RADIO MODEL 50-526

Model 50.526 is similar to Models 50.522 and 54524.It is housed in a new phenolic -plastic cabinet.

A pilot lamp, 1100, is added between pin 2 and pin 3of the 35Z5GT rectifier tube.

A lcmegehm resistor, R305, is added from the ara-ccirait, pin 5 of the 14136 detector, to 13-, pin 4 of thesame tube.

A 68 -ohm resistor, 11304, is added in the cathode lineof the 12BA6 i-f amplifier. This resistor is connectedfrom pin 7 of the I2BA6 to pin 7 of the 1486.

R301, the grid -return resistor, Is changed in valueto 1 megohm.

SECTION 1

POWER SUPPLY

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSPHILCO RADIO MODEL 50-620

SECTION 4 - RF AND CONVERTER CIRCUITS

COMET TO CHASSISFOR LOOP CONNECTION

COO!

SWINE

/4400 3OHMS

CV/00

Emt, 125,,

11Pi.auF

CsaT

W100

Philco Model 50620 is a portable four -tube super-heterodyne providing reception on the standard -broad-cast band. A high -impedance loop within the cabinetnormally provides adequate signal pickup.

rCAM

COMMA

C402

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rae

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F'100 01014

(-CONDENSER ST5.1BOLS

FIXED TRIMMER VARIABLE COIL WITH

RE, IT ANDTUNE MK

AUDO 500AL ALL REDSIOR VALUES

OSC SG11(4 PATH OTHERWISE MARKED

IN OHMS UNLESSPATH

SECTION 1- POWER

Sedion 1 -Power SupplyMake the tests for this section wi h 2

d -c soltmeter. Connect the negative leadto B-, test point Eh connect the positivelead to the test points indicated in thechart. The voltage readings given weretaken with a 20,000 -ohms -per -volt meterat a line voltage of 11 7 vult5, 4.1.

Set the volume control to minimum.

The Inner} pelt should be replacedwhen the "e voltage drops below 5

volts, or the DIr voltage drops belowHO volts.

CONVERTER

Cd0.5

1.47rimy

CODA I 'g101AMF

I

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5+

,T400

1117 -1/-

SUPPLYSUPPLY

2300

2.2 MEG

SECTION 3 -IF, DETECTOR AND AVC CIRCUITS

CAPAOTANCE

15T AUDIO

ridIF ANON

600II

230/ f.g

mMP

RED 5200(PART OF

LS2002

ES .002MF

(PINVIEW)PC100

(P OF CIO)20°5f,..f.

SECTION 2 - AUDIO CIRCUITS

A.. A Phil.. NINO 50-610, Sectionalised Schntafis Diagram, Showing Test Points

TROUBLE SHOOTING

If the "NORMAL INDICATION" is Flare I. helm BMW. Skewing Semlies 1 Test Pointsobtained in step 1, proceed wdh the testsfor Section 2 (audio circuits); if not, isolate and correct the trouble in this section.

S.' TESTPOINT

NORMALINDICATION

ABNORMALannthtrion

POSSLBLE CAUSE OF ARNORMAL INDICATION

Ma/1(15

A0 90v

Tomb I s as, . so aM by the esono 1.15

D 12ST Low voltageNo vohage

Delecttve: CR100. Oqn CIOIA.DetectIvet CR100. Open: S100. B101.

3 E 125, Low voltageNo vollage

00000s4 rosins... meo. Lenky: GIOIA.esoth: sum Shorted: GIOIA.

0 F 115. Low voltageNo voltage

Changed meletancen 51010. Leaky: 01015.0,011: 01010. Shorted: CI0111.

a A ,.3v Lova voltageNlint voltageNo voltage

Changed reelstance: RIMS.Open: Ons or mons Moments, R205 .

Oqm RI0111. 5101.

i C 00v Low voltageNigh voltage00 voltage

Chcmged resistarrem RIM Leaky: CIOIC.Open. 11105.. 0200.. 5100.Open: 0102. 5101. Shorted: CMG.

LietenIng Tem: Abnormal hum may be caused by open Clam CimC, or C202,

This part located M another .ction. may cause abnormal InMcalion M Mis section.

Section 2 -Audio CircuitsFor the tests in this section, 000 00

audio -frequency signal generator. Con-nect the generator ground lead to B-,test point 13; connect the output lead

through a .1-mf. condenser to the testpoints indicated in the chart.

Set the radio volume control to maxi-mum.

If the "NORMAL INDICATION" isobtained in step 1, proceed With the testsfor Section 3 (i-f, detector, and 4 -v -c circoils) ; if not, isolate and correct thetrouble in this section.

TROUBLE SHOOTING

Figure 1. RoMeen Yleve. Skewing heels. 1 Test Pedals

STEP TEST POINT NORMAL INDICATION POSSMLE CAUSE OF ARNORMAL INDICATION

A Loud. clear epeaker output withmoderaM generator Inpul.

Trouble In MN section. ImIale by the lalloveing 1.15

1 C Clear speaker ontew wok stronggenerator Maui

Detective: 304. 1.13100. Open: 0204. 1200. Shorted: C203. C104.C305. T200.

3 A S... us mP I. rotthavx sus. ono knitam. Onsm Ctho. 9201. 0102. 0103.C203. Shorted: 0201. C301,

Liston. Teat Distortion may Ms caused by Maky or ebortedsignals moy be caused by leaky or shorted C200.

C103. or by changed resistance 01 5200. Distortion or strong

This part. located In cmother section. Ina, cause abnormal InMsallon in this section.

OPERATING voLTAGE5

POW. COMMANITION !stra An, ts Ns. se mirk,

itti'Z'sktrktins:.°°:tas:1

Section 3 -I -F, Detector, And A -V -C CircuitsFor the tests in this section, use an r -f

signal generator, with modulated output,set at 455 ko. Connect the generatorground lead ro B-, test point 13; connectthe output lead through a .1-mf. conden.ser to the test points indicated in thechart.

Set the radio volume control to maxi-mum.

If the "NORMAL INDICATION" isobtained in step 1, proceed with the restsfor Section 4 (r -f and converter circuits);if not, isolate and correct the trouble inthiS

Mo.* 3. BON. View, Sheen, Se0.000..Tellesection.

To provide a complete i-f amplifier check, test point A Tor this section is placed at the grid of the mixer in Section4; therefore, the effectiveness of step as a master check is dependent upon the condition of certain parts .0 1110

mithr circuit. These parts are listed below under "POSSIBLE CAUSE OF ABNORMAL INDICATION."

L5200

TROUBLE SHOOTING

STEP TEST POINT NORMAL INDICATION POSSIBLE CAUSE OF ABNORMAL INDICATION

A Loud. nom sparer °wow withweak eeneraias Input.

road* sn this section. Nouns by in. roll.a, team.

0 0 J'..001.000.00' 0,10a".'"...1. 17r0.0c.'CI03,TLOITo.:17'1,;T;!'t.Z1`.;°::: -ro',;. Op."

L301A. L3013. C301A. C30111.' . '

3 A Same as step I. Detective: IRS'. Misaligned: 2300. Cqn: C300/1. L300A. L30011.C300B. T430% Shorted. C400A. 01001, C300A. L300A. L300E.C300B.

Thle part located M another sect.. raay cau. abnormal Mdlcallon M MI. seek..

Section 4 -R -F And Converter CircuitsFor the to in this section. with the

exception of the oscillator test, the an ehsignal generator with modulated outut.Connece thesenerator ground lead totest point B; connect the output leadthrough a 4-mf. condenser to the testpoints indicated in the chart.

Set the radio volume control to maxi-mum. Set the toning control and signal -generator frequency as indicated in thechart.

If the ' NORMAL INDICATION" i

TROUBLE SHOOTING

obtained in step 1, further tests should b "44 4, 940,4.01.0 0040;. 4400, 04.4 p.munnecessary; if not, isolate and correct thtrouble in this section. If the trouble is not revealed by the tests for this section, check the alignment.

STOPWET

POINTSIGNAL GEN.FREQUENCY

RADIOTUNING

NORMALINDICATION

POSSIBLE CAUSE OFARNORMAL INDICATION

1 A 1000 04. Tune le elsnaL Loud. clear speakeroutput 1.11111 weak

Trouble In 101. section. Isolate by Melollowing teq.

0 C lo D 10.met; sq notebelow./

Riotrie throe.ran**.

Napa.. S to to... °elec.*: IRA OPMar. IRO R. 11,10. CAOS.Shorted: COOS. CONC. COOP°.

1 I A 1000 kc. Tune. to Menai Same as men I. Open: C401. C403. R401. R403, LA400.

MODEL 54.524 103

MANUAL OF 1950 MOST -OFTEN-NEEDED RADIO DIAGRAMSPHILCO RADIO MODELS 50-925, Code 123, and 50-926

AM ALIGNMENT PROCEDURE FM ALIGNMENT PROCEDUREMake alignment with loop aerial connected to radio.

The AM alignment should be completed before MeFM alignment is made.

DIAL POINTER - With tuning.condaser plum fullyDIAL adjust pointer to coinade with index mark atlow -frequency end of scale

RADIO CONTROLS - Set volume control to mai-mum, set bend switch for broadcast reception, ad settuning control as indicated in chart

OUTPUT METER - Connect across voice -coil termi-nal,.

SIGNAL GENERATOR - Use AM of signal gen-erator, with modulated output. Connect generator andset frequency as indicated in chart.

OUTPUT LEVEL - During alignment, signal.gen-erttor output must be at to hold output -meterreading below 1.25 volts.

AM ALIGNMENT CHART

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104

Make AM alignment firstRADIO CONTROLS - Set volume control to maxi.mum, set band switch for FM reception, and set tuningcontrol as indicated in chart.OUTPUT METER - Connect across voice -roil ttrrni.oak. (This meter is used only for step 3.)DC VOLTMETER - Connect negative lead of d.cvoltmeter (resistance of at Inc 20,000 ohms per vok)to pin 2 of 1908 tube, and positive Ind to chassis. Use0 -10 -volt Longo.

SIGNAL GENERATOR - Use AM of signal gen-erator, with modulated output Connect ground Indto chassis. Connect output Ind and set frequency asindicated in chart. Generator mut have sufficient out-put to give reading of

to8.5 vole, on d -c

voltmeter, during alignment, generator output must beattenuated to hold meter reading at this value.

NOTE: Before starting FM alignment, allow radio andsignal genttator to warm up for 17 minutes.

FM ALIGNMENT CHART

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSPHILCO RADIO -PHONOGRAPH MODEL 50-1420

PHILCO RADIO -PHONOGRAPH MODELS 50-1422 AND 50-1423

Section l-Power SupplyFor the tens in this section, use a d. voltmeter. Con-

pect atenegthve lead 'to B-, test point 13, connect theositive Ind to the rest points indicated in the chart. The

voltage readings given were taken with a 20,000-ohms-per-vok meter at a line voltage of 117 volts, at.

Figure 1. Bottom View.

Showing Section I Test Points

These two models are similar to Model 504420.

TROUBLE SHOOTING Section 3-I -F, Detector, and CircuitsTurn on the power, and set rho volume control to

For the ass innimum. rho sea., use an pf signal genet.mi

If the "NORMAL INDICATION" is obtained in no nor, with modulated output, set at 455 ho. Connect the1, proceed with the tests for Section 2 (audio circuits) if generator ground lead to B-, test point B; connect thenor, isolate and correct the trouble in this section. output lead through a condenser to the test points

indicated i the chart.Set the radio volume control to maximum, and the

radio-pho o switch to the radio position.and

then se1 until the inning condenser is folly

meshed Flamm 3. Bottom View. Showing Section 3 Test PointsIf the ' NORMAL INDICATION" is obtained in step I, proceed with the tests for Seaton 4 (pf and converter

circuim); f nor, isolate and correct the trouble in this section.To pro idea complete i-f amplifier check, test point A for this secfion is placed at the grid of the mixer in Section 4;

therefore, the effectiveness of nep I as a master check i dependent upon the condition of certain parts in the mixer circuit.These parts are hoed below under "POSSIBLE CAUSE OF ABNORMAL INDICATION."

TROUBLE SHOOTING

MUMS CAUSE Of ABNORMAL INDICATION

A 120 volts roTrouble in dos moton. Isolate by the followine ten..C

-

212 volts No volrtme

Low whop

Defective: 5021GT, 1100.Shorted: C100, C101, C102A.Leaky: 0100, C101, GINA.

High odtage Open: RI00.D 205 volts No voltage Defmum: 50114-T.

Shorted: C10213.Open: 8100.

Law voltageHigh voltage

Loeb]: CIMMOpen: R101, R102, T2

4 A 1 20 v No voltage Shorted: CINC.Open: 11101 mid 8102 lin pemllell.

Low volts. Leaky: C102C.

This pa., located in pother section, ma come abnormal iodic Ito,, it, this section.

Section 2-Audio CircuitsFor the tests in this section, use an audio -frequency sig.

.1 generator. Connect the generator ground lead ro B-,test point B; connect the output lend through a .1.mf, con-denser to the test points indicated in the chart.

Set the radio volume control ro muimum, and the radio-

Figaro 2. Bottom View,Showing Section 2 Test Points

TROUBLE SHOOTINGphony: switch as indicated in the chart

If the "NORMAL INDICATION" O obtained in stepproceed with the tests for Section 3 04, detector, and

circuits); if not, isolate and correct the trouble inthis section.

POSSISSS GAUSS OF ASNONDIAL INOIGFION

I (a)

1 (b)

A

E

Radio

Photo.

Loud, clear speakerootput with mo

or inpmderate

Trouble to this metton. Isolate by the follow., tenn

2 C Radio Clearyoutput withstrong input.

Doherty,: L5200, 25L601. Shorted: T200, C203, C201,0204, 202. Open: T200, 8204, R205, 11203. Leaky:C203.

D Radio Lod,elear output richDefeetiv'moderate input.

: 6A06 Shorted: 0200 C205. Open: 1201,11202, R201, Ef8/6. Leaky: 1801:

4

5

A

E

Radio

---I5 ,LioLoud,clear output with

moderate input.Same a. step 1.

Op..: R200 (rotate), 0200, WS. Shorted: WS.

Open or . ors, , .

Li. .e i n g Tee, Distortion rosy be caused by miry C20L Distortion on wrong sisoak may be caused by shorted or leaky C200.

SECTION 4RF AND CONVERTER CIRCUIT

tea

SUP TEST POINT NOENAS INDICATION 1103316LE CAUSE OF UNOISMAL INDICATION

1 A Loud, clear speaker outputwith week generator input

Trouble in this section. Isolate by the hollowing woo

C Loud, clear output wi.strong input.

Defeoive: I2BA6, 6AQ6. Shorted: C300B, C3011, C3010, C301C,C3010, 0303, C304, VS, L3008, L30IA, L30IB. Open: 8302, 8303,R304, 8305, L300B, L30IA, 13010. R301, C301A, C3016. Leaky:C303, C304. Misaligned: 2301

A Loud, clear output with weakinput.

Defective: 1213E6'. Shorted: C400.6., COME., C300A, 1.3000, L300B,C302. Open: L3004, 8300, C300A, C300B. Misaligned: 7.300.

This part loused in ono her section, may cause abnormal indication in this section.

Section 4-R -F and C ter CircuitsFor the tan in this section, with the exception of the

oscillator test, use an r.f signal generator with modulatedoutput. Connect the generator ground lead to B-, testpoint B; connect the output lead through a .1.mf. condenserto the test points indicated in the chart.

Set the radio volume control to maximum, and the radio-phono switch to the radio position. Set the tuning controland signabgenerator frequency as indicated in the than.

If the "NORMAL INDICATION" is obtained in stepI, further tests should be unnecessary; if not, isolart andcorrect the trouble in this section. If the trouble is notrevealed by the tests for this section, check the alignment.

TROUBLE SHOOTING

Figure 4. Bottom View. Showing Section 4Test Points

STIP KM "HIP, MITIG ,:111:41t. pOSSISIX CAUSE OF ASINORMAL INDICATSON

1 A 1000 kc. Tune Jo L :.,:.1,e,!,,e,,Ir,with wee. gen.entor i no

Tr,onn.lt .::Iii. section. Isolate by the follow.

C -DOw. Test (seenote below/.

Rotatethroughranee.

Neastiye 1.8 to 3.2volts.

Defective: 128E6. Storied: 0400, C40013, C402,COI, L400A, 1.10013. Open: C402. LAMA,L40013, ROI, R402.

3 A 1000 kc Tune tosignal

Same .. step I. Shorted: LA400, C400, 4 0A. Open: LAN.0404.

OSCILLATOR TEST: Connect the positive lead of a hi &resistance vohnicte to the oscillator cathode (pin 2 of 1213E6),ct v;;t,point D; connect the prod e d of the negativ lead through a 100.000 -ohm isolato gridrertstor to the oscillator id Ipm I of 1213Evolts. f the oscillator is indicated by negative voltage

II g mth h ( d ,11 20,000-ohos-Per-volt ineter/ ...Is., the mining rause.

SECTION 3IF, DETECTOR, AND AVC CIRCUITS

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Figaro 5. Mike Model 50-1420, Sectionalized Schematic Diagram. Showing Test Points

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116010-1040 501880451 SUMO a WV 00811011

106

'hike TROUBLE -SHOOTING ProcedureFor rapid trouble shooting, the radio circuit is divided

into four sections, AS follows:Section 1-the power supplySection 2-the audio circuitsSection 3-the Lf, detector, and a.v. circuitsSection 4-rhe r,f and converter circuits

Test points are specified for each section, and ate indi-cued in the sectionalized schematic diagram. The trouble-shooting procedure given for each section includes a simtplified test chart and a bottom view of the chassis showingthe locations of the test points and the components of thatsection.

In each chart, the first step is a master check for deter-mining whether trouble exists in that section, without goingthrough the entire than.

Failure to obtain the "NORMAL INDICATION" inany given step indicates trouble within the cirtuk under nest.

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NUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS

PHILCO MODEL M-20 ALL -SPEED

AUTOMATIC RECORD CHANGER

The material on this changerwhich is used in many Philcocombination models begins onthis page and continues throughpage 118. This material isreproduced through the courtesyof the Philco Corporation.

7/6dee 7/1-20

DESCRIPTION OF OPERATIONAL CYCLES

Power for the motor is obtained through the on -off switch mounted on the bridgeassembly. This switch is operated manually by the control button with positionsOFF-MAN-AUT-REJ. This button is located to the left of the record -shelf assembly,on the top of the Record Changer.

The Record Changer has three speeds, controlled by the Speed Selector locatedto the right of the record -shelf assembly. The positions of the Speed Selector areST'D PLAY- 45 -LONG PLAY. These speed changes are brought about by theshift lever, which changes the positions of the idler wheel and pulley with respectto the motor shaft.

The changer mechanism of the Record Changer is brought into action when asmall retractable gear segment, mounted on the cam gear, is released, and engagesthe hub gear of the turntable shaft, causing the cam gear to be driven. While a recordis playing, the retractable gear segment is held in the retracted position by the trip -plate retaining wall, which engages the roller of the gear segment. The segment isreleased either manually, by pushing the OFF-MAN-AUT-REJ control to REJ, orautomatically, when the changer tone arm reverses direction as the needle followsthe eccentric finish groove of a record. For 45 r.p.m. automatic operation, an addi-tional trip mechanism is brought into play. This trip mechanism is actuated by a tripstop, mounted on the trip receiver. When the needle of the tone arm enters the finishgroove of a 45 r.p.m. record, the trip stop engages the trip lever, which releases thehammer; this hammer strikes the trip plate, and pushes it aside. The gear segmentis then released, as explained above, for either the standard or long -play operations.

The tone arm of the Record Changer is operated by two link assemblies attachedto actuator levers, which are in contact with the cam surfaces of the cam gear. Whenthe cam gear starts rotating, the lower actuator lever is pushed outward first, and thelink assembly with the long cord attached to it raises the tone arm off the record.As the cam gear continues to turn, the upper actuator lever is pushed outward, andits link assembly pulls the tone arm out against the rest post. At this instant, a rolleron the cam gear makes contact with the push -off actuator (which is connected to therecord -shelf assembly through a series of push -off bars), and operates the record -dropping mechanism.

After the record has dropped to the turntable, the cam releases the upper actu-ator, permitting the tone arm to move inward. As the tone arm moves toward thecenter of the turntable, the index finger engages one of the selectors, which stopsthe tone -arm travel at a point just above the start groove of the record. Followingthis action, the lower actuator, which is engaged with the lower cam surface of thecam gear, starts riding inward, relaxing the long cord and link assembly, allowingthe tone arm to set down onto the record. 111

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS7/tedel 7/1-20 ADJUSTMENTS

INDEXING OR SET -DOWN

7" RecordSet a 7" record on the turntable, push the OFF-MAN-AUT-REJ control to RE J,

and rotate the turntable by hand approximately 41/2 turns. The tone -arm needle

FEELER 76-5249 -.Nu

SELECTOR HINGE56-7494

SELECTOR HINGE SPRING56-7495

FIGURE 1. 7" INDEX ADJUSTMENT

FIGURE 2. 10" INDEX ADJUSTMENT

SCR "0 "

SCR V'8"i

ADJUSTING SCREW TRIP FINGER54-7613-1ON TRIP RECEIVER

112

TRIP ARM STOP56-4614

ea

FEELER SPRING56-7479

MAGNETIC INDEX STOP76-5497

PUSH OFF BAR

LOCKING SCREW

ENGAGEMENT BETWEENSTOP AND TRIP

TRIP LOCKING SCREW

TRIP LATCH RETURN SPRING56-7033-2

TRIP LATCH76-5247

HAMMER76-5324 TRIP FINGER

56-7486TRIP PLATE HAMMER ACTUATOR SPRING

76-5252 56-7033

FIGURE 3. TRIP ADJUSTMENTS

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSADJUSTMENTS (Continued) 04/ 7H-20

should be approximately 1/2" above the record at this point. Loosen the clamp screwon the trip arm slightly (figure 9); then hold the tone arm steady, 1/8" in from theedge of the record, and set the trip arm so that the magnetic index stop, Part No.76-5497, is in contact with the selector hinge ( inside selector ), Part No. 56-7494, asshown in figure 1. The index stop should engage the selector hinge by a minimumof 1/2".

Tighten the clamp screw, leaving 1/32" vertical play, or clearance, between thetrip arm and the base plate.

10" RecordMake the index adjustment for 7" records first. Check 10" indexing by the same

method as that outlined above. With the needle point 1/2" above the record, and1/8" in from the outside edge, the index stop should be in contact with the middleselector, Part No. 56-7478, as shown in figure 2.

Ordinarily, the 10" index is satisfactory after the 7" index adjustment is made;if not, bend the selector slightly to the right or left, as required, for the proper set -down of the needle.

12" RecordAdjust as given above for 10" records, except that the index stop should contact

the outside selector, Part No. 56-7478. If the indexing is incorrect, bend the selectorhinge slightly to the right or left, as required, for proper set -down.

TRIP ACTION

10" or 12" Standard or Long -Play RecordsWith a 10" or 12" record on the turntable, the Speed Selector set to either

ST'D PLAY or LONG PLAY, and the OFF-MAN-AUT-REJ control in AUT posi-tion, place the tone arm in the finish, or eccentric, groove of the record. The tripfinger, Part No. 56-7486, now rides over the ratchet of the trip plate, Part No. 76-5252,as shown in figure 3. The trip finger should ride at an angle of 25° to 30° with respectto the ratchet. To obtain the correct angle, adjust the screw on the trip receiver, PartNo. 56-7491, as indicated in figure 3; Make certain that the vertical center line ofthe trip finger coincides with the center line of the ratchet. To obtain this alignment,loosen screw "A" slightly, and screw "B" completely, on the trip receiver, and swingthe trip receiver to the right or left, rotating about point "A" until the trip fingeris centered over the ratchet; then tighten the screws.

When this adjustment is made, care should be taken to prevent the trip receiverfrom being pulled in toward the trip arm too far, as this will prevent the trip -armstop from engaging the selector hinge by a minimum of 1/8". A compromise betweenthese two adjustments should be reached.

The index adjustment will be affected when making the above adjustments.Remember that these three adjustments are interrelated, and that, when any one ofthem is made, the other two should be rechecked.

7" - 45 R.P.M. RecordsPlace a 7", 45 r.p.m. record, with adaptor insert, on the turntable. Set the Speed

Selector to 45, and the OFF-MAN-AUT-REJ control to AUT position. Set the tonearm on the portion of the record which contains the leadin grooves. The mechanismshould trip when the needle reaches a point approximately 1/8" from the last groove(which is concentric). If it trips before reaching this point, bend the trip finger,Part No. 56-7486, away from the trip -arm stop. If it fails to trip when this point isreached, bend in the opposite direction.

The trip -arm stop should engage the trip by a minimum of 1/3 2" in both the hori-zontal and vertical planes, as shown in figure 3. This may be adjusted by looseningthe trip locking screw, and sliding or raising the trip to the desired position.

The horizontal force required to trip the changer and initiate the change cycleshould not exceed 2 grams at any turntable speed.TONE -ARM HEIGHT AND LIFT

With the changer out of cycle, and the tone arm free, set the arm over the baseplate. The needle point should be approximately 3A 6" above the base plate, as shownin figure 4. To adjust the clearance, bend the protruding ear of the swivel post(bending the ear upward increases the clearance, downward decreases the clearance),as shown in figure 5. Now raise the tone arm to its maximum height, and place itagainst the rest post. There should be a minimum of 1/8" clearance between the lower 113

NUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSedge of the tone arm and the top of the rest -post hook. Adjust the ear on the swivelpost until a mean is reached between the correct rest -post clearance and base -plateclearance.

TONE -ARM HORIZONTAL AND VERTICAL TIMING

Before making the vertical and horizontal adjustments, make the tone -arm heightand lift adjustments described above.

NEEDLE POINT 3/32" (MIN.)ABOVE BASEPLATE

BEND EAR TO OBTAIN CORRECTBASEPLATE CLEARANCE

ADJUST EAR OF SHAFT AND SWIVELASSY.

76.5207-1

FIGURE 4. , BASE -PLATE -CLEARANCE ADJUSTMENT FIGURE 5. TONE -ARM HEIGHT AND LIFT ADJUSTMENT

11G

VERTICA76-5322

HORIZONTAL ACTUATO76-5323

ALOF

SAFETY SPRING:.56-4608

VERTICAL TIMING-ADJUST LOOPLOWER LINK

56-7023

FIGURE 6. HORIZONTAL ANDVERTICAL TIMING ADJUSTMENTS

FIGURE 7. SPECIAL RECORD -SHELFGAUGE, SHOWN IN CORRECT POSITION

114

61

"a%

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS,t? -8 ADJUSTMENTS (Continued) Wt,Odei n-20

For the vertical timing, start with the changer out of cycle and the tone armon the rest post, push the OFF-MAN-AUT-REJ control to REJ, and rotate theturntable approximately 11/2 revolutions by hand. At this point, the lower eccentricportion of the cam -and -gear assembly, Part No. 76-3995-2, fully engages the lower(vertical) actuator (the actuator with the cord), Part No. 76-5322. Adjust the wireloop of the lower link, Part No. 56-7023, figure 6, by, squeezing or opening the loopso that the safety spring is expanded approximately 3/40". With this adjustment, theear of the tone -arm swivel post makes firm contact with the lower end of the cutouton the tone -arm pivot assembly.

For the horizontal timing, start as given in the above paragraph. At the samepoint, 11/2 revolutions from, the start of the cycle, the upper eccentric portion of thecam gear fully engages the upper (horizontal) actuator, Part No. 76-5323. Adjustthe wire loop of the upper link, Part No. 76-7023, with the short cord, figure 6, bysqueezing or opening the loop so that the safety spring is expanded approximately3/42". With this adjustment, the tone arm should be snug against the rest post, butnot so tight as to cause undue slapping as the arm returns to the rest post during cycling.

RECORD SHELF

Set the record shelf to the 10" position, with the changer out of cycle. Loosenthe two hex -head drive screws that hold the record -shelf assembly to the changerbase plate just sufficiently to allow movement of the record -shelf stanchion. Placethe Philco record -shelf gauge, Part No. 45-1672, over the spindle and onto therecord shelf, as shown in figure 7. Move the record -shelf assembly away from thespindle until the large, curved part of the gauge drops even with the record -shelflips. Now push the record shelf and gauge lightly against the spindle, taking outall play toward the spindle; keep the lips of the record shelf in even contact withthe edge of the gauge. Tighten the two hex -head screws.

PUSH -OFF

With the changer out of cycle, push the OFF-MAN-AUT-REJ control to REJ,and rotate the turntable 2 revolutions by hand. At this point, the push -off actuator,Part No. 56-4588, is in its most forward position, in contact with the roller on thecam gear. Loosen the push -off -bar locking screw (indicated in figure 3) slightly (justsufficiently to allow adjustment), and squeeze the push -off ears toward each otheruntil the slide plate on the record shelf extends between 3/44" and 3/42" beyond thelips of the shelf. Tighten the hex -head push -off -bar screw.

NEEDLE PRESSURE

Use the Philco gram scale, Part No. 45-9531. Calibrate the scale to zero byholding it upright for vertical measurement, and setting the pointer to the centerline of the scale. The center is the "0" point, and each small division on either sideof "0" is equal to one gram.

After the scale has been calibrated to zero, hold the scale perpendicularly tothe tone -arm head, and support the tone arm by placing the standard -play needlein the hole at the end of the gram -scale arm, as shown in figure 8. By lifting thegram scale carefully, raise the tone arm approximately 1/2", and note the reading.Then lower the tone -arm, and note the reading. The average of these two readingsis the needle pressure, which should be between 7 and 9 grams. The pressure is adjust-able by bending the ear at the rear of the tone arm to which the tone -arm spring isanchored, as shown in figure 9. Bending the ear so as to stretch the spring decreasesthe needle pressure; bending so as to relax the spring increases the needle pressure.If the needle pressure is out of tolerance, make the above adjustments gradually, andrecheck after each change, as a small movement gives a rather large variation inneedle pressure.

When making this adjustment, be careful not to bend or distort the bracket.If this bracket is deformed, the needle pressure on the last record of a stack willdiffer from the needle pressure on the first record. When the proper needle pressureis attained, the upper edge of the ear should be parallel to the rear, lower edge ofthe tone -arm shell. If the bracket was bent while adjusting the ear, gently pry downor push up the bracket (applying even pressure on both sides) until the ear andtone -arm shell are in proper relationship. 115


214dee 211-20ADJUSTMENTS (Continued)

VERTICAL FRICTION

To measure the vertical friction, take two gram -scale readings as explainedabove under NEEDLE PRESSURE. One-half of the difference between the two readingsis the vertical friction, which should not exceed 1.5 grams.

FIGURE 8. MEASURING VERTICAL FRICTION

116

BEND EAR OF BRACKET56-7402

NEEDLE PRESSURE SPRING56-7403

FIGURE 9. NEEDLE -PRESSURE ADJUSTMENT

COUNTERWEIGHT

FIGURE 10. MEASURING HORIZONTAL FRICTION


Weadee 711-20HORIZONTAL FRICTION

Calibrate the gram scale by laying it flat, face -up. Set the pointer to zero (center

mark).Place a counterweight on top of the rear end of the tone arm, with the changer

out of cycle; move the counterweight until the tone arm is balanced horizontally,and the needle point clears the turntable. Hold the gram scale face -up, place itspointer against the side of the pickup, and slowly move the gram scale so as to pushthe tone -arm horizontally with the pointer, as shown in figure 10. Note the readingof the gram scale while moving the tone arm throughout its entire travel (outsidethe trip range). At no time should the horizontal friction (the force required tomove the tone arm) exceed 11/2 grams, nor be less than 3/4 of a gram.

Note: Whenever any repairs or replacements are performed, all adjustments shouldbe checked, and any necessary adjustments made. When making adjustments, checkthe lubrication at all points indicated in the LUBRICATION section, and lubricatewhere necessary, after cleaning off old and excess grease with a soft brush and carbontetrachloride.

UNEVEN TURNTABLE SPEED (WOWS)

Uneven turntable speed may be caused by the following conditions.1. Dirt under and around the idler -wheel assembly.2. Idler -wheel spring loose or missing.3. Flat spot on idler -wheel tire or on turntable.4. Loose or worn pulley belt.5. Oil or grease on idler -wheel tire, pulley, or drive shaft.

III

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TONE -ARM OUTPUTSELECTOR SWITCH

42-1873

PHONOMOTORPOWER

.04 (.4F

WIRING DIAGRAM OF MODEL M-20

PHONO INPUTPLUG

117

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSWaved 20 LUBRICATION

When the Record Changer is brought in for service, it should be well cleaned with afine brush and carbon tetrachloride. Remove the needle guard and clean out accumu-lated dust with a fine brush. Remove all dirt and old grease and oil. When applyingnew grease and oil, use it sparingly. Lubrication points are shown in figures 11 and 12.It may be necessary to remove some parts and assemblies in order to properly lubri-cate them. For example, the cam gear and actuator levers should be removed tolubricate the cam -gear spindle and the actuator stud.

GREASE

GRAPHITE

GREASE

GREASE

GREASE

118

GREASE GREASE

FIGURE 11. TOP VIEW, SHOWING LUBRICATION POINTS

FIGURE 12. BOTTOM VIEW, SHOWING LUBRICATION POINTS

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RCAVICTORBattery Personal Receiver

MODELS 8641, 8642, 81143Chassis No.

TOP

pile

ALIGNMENT 2S

RC -1069, RC -1069A, RC -1069B

LOOP

TOP

E.

Fig. 3-Alignment Shield

TOP

DIMENSIONSIN INCHES

TO 354 PLATE

1ST. I. F.TRANS.C6 C7455 KC.

LI OSC.600 KC.

San

A rubber band should be placed aroundeach tube for cushioning.

Fig. 5 -Tube and Trimmer Locations

CI10-274

V1CON V1R5

-45V (6*KC) C0- eV (140000KC) S 15CO20

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R215K

122

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Alignment Procedure

Output Meter.-Connect meter from top lug of TB5 (plate of 3S4)to ground. Turn volume control to maximum position.

Test-Oscillator.-For all alignment operations, connect the lowside of the test -oscillator to the receiver chassis, and keep theoscillator output as low as possible to avoid a -v -c action.

Alignment Shield.-It is necessary to use a shield during oscil-lator alignment.

Fig. 3 shows the modifications necessary to convert the centerstrip portion of a case into a convenient shield to be used as asubstitute for the regular case center strip during oscillator align-ment.

If a substitute case is not available, a shield may be improvisedusing a sheet of aluminum (DO NOT USE STEEL) to approximatethe shielding effect of the case on the IRS tube, tuning condenserand oscillator coil.

StepsConnect the highside of test osc.to-

Tune test-osc. to-

.Turn radiodial to-

Adjust thefollowingfor max.

peakoutput-

C12, C131 2nd 1.F

trans.Quiet point

Connection lug of455 kc near1,600

kcCl located on rear C6, C72 of gang in series

with .01 mt. let I -Ftrans.

3 Repeat steps 1 and 2

144 1,400 kc Rock gang C4 (ose.)

i-

*Antenna coupling 605 loop 600 kc Rock gang LI (osc.)

t

6 Repeat stops 4 and 5

Steps 4 and 5 require a coupling loop from the signal gen-erator to teed a signal into the receiver loop located in the lid.This loop should be loosely coupled to the receiver loop antennaso as not to disturb the receiver loop inductance.

f ALIGNMENT SHIELD MUST BE USED. (See text.)

V3 V42.5. DET - A F -AVC OUTPUT

11/5

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10, MEG,

11Fi V.

BATT.

K.1000C'

VOLTAGES SHOULD HOLD WITHIN ± 00%CiLWITH RATED BATTERY VOLTAGE.

*MEASURED WITH CHANALYST OR.VOLTOHMYST.

ALL VOLTAGES MEASURED WITH RESPECT -TO CHASSIS GND.

R11820

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RCAVICTORAC -DC Radio Receiver

MODELS 9X561, 9X562Chassis No. RC -1079-B RC -1079-C

Lead Dress1. Dress all heater leads down to chassis and away from

all audio grid and plate wiring.3. Dress power cord down to chassis base and corner.3. Dress capacitor C18 against back apron.4. Dress capacitor C13 down to base alongside of

shielded lead.5. Dress output transformer leads down to chassis.6. Dress capacitors C9 and C15 as direct as possible.7. Dress dial lamp leads on top of chassis between 12SQ7

and 50L6GT tubes; below chassis, as short as possibleto rectifier socket.

8. Dress excess loop leads away from tubes and clear oftuning condenser.

Dial CalibrationWith the tuning condenser fully meshed, the dial

pointer should be set to the first score mark at the left-hand end of the dial back plate. The four score marksrepresent: Max. cap. 600 kc 1400 kc min. cap.

MAR.CAP.

PULLEY

SOOKC

SHOWN WITH TUNINGCONDENSER AT MAO.CAPACITOR (CLOSED)

DRUM

DIAL CORD

DIAL RACK PLATE

124

1400 KCMIN.CAP.

Dial Indicator and Drive Cord

LILOOP

VI12SA7

CON V.

OSC.COIL

GL30 0

cr a

93V

-

g:C3T

VOL. CONT.e SWITCH

V212SK7

I. F.

T1

Alignment Procedure

Test -Oscillator. - For all alignment operations, con-nect the low side of the test -oscillator to the receiverchassis, and keep the oscillator output as low as possibleto avoid a -v -c action.

On AC operation an isolation transformer (115 v./115v.) may be necessary for the receiver if the test oscillatoris also AC operated.

StepsConnect thehigh side of

test -oscillatorto-Tune

test-osc.to-Turn radiodial to-

Adjust thefollowing formax. outputp

12SK7 1-F grid T2 (top1 through 0.1 and bottom)

mid. capacitor Quiet -point 2nd I -F trans.455 kc 1600 kc

Stator of *T1 (topend of dial2 Cl through and bottom)

0.1 mfd. 1st I -F trans.3 1620 kc MM. cap. C4 (osc.)4 Short wire

placed near1400 kc 1400 kc tC2 (ant.)

5 600 kc 600 kc L3 (osc.)Rock gang

loop toradiate signal

6 Repeat steps 3, 4 and 5.

'Do not readjust T2 when test oscillator is connected to Cl.tWhen adjusting C2 (ant. trimmer) it is necessary to have the

loop in the same position and spacing as it will have whenassembled in the cabinet.

PHONO INPUT JACK RADIO PHONO SW.52

V312SQ7

DET.-AF-AVC

TOP E BOTTOM CIANT.

C305C.

C2'14 C41400KC 1620 KC

T2

Tube and Trimmer Locations

V3 V412SQ7 50L6-GT

DET.- A F -AVC OUTPUT

I 701+ 10G=

I0 155

7470

CIS.002

krak

T3DLO IL

107V. cI7 I.01 ,

4

RII

11(150RI4a

93V.

R53.3 MEG.

RE33011 RADIO

CIS

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CATHODE CURRENTS12547 10.05 MA125K7 10.25 MA12507 .13 MA501-5-67 33.0 MA3525-67 55.0 MA

K-1000VOLTAGES MEASURED TO COMMON WIRINGWITH VOLTONMYST SHOULD HOLD WITHIN 320%WITH RATED POWER SUPPLY. CAPACITOR VALUESGREATER THAN 1 ARE IN MMF., LESS THAN 1 AREIN MF. UNLESS OTHERWISE INDICATED

C9.001

PHONO S2 I-41,

-

PHONO

g.13311

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617 ir

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115V. A.C.

j--0;;0 POWERSUPPLY

-(ON VOL. CNTL.)


RCAVICTORMODELS 9X641, 9X642

Chassis No. RC -1080 RC -1080A

FUSING SV. FIXED SIAS

600 KC

150%I

7%- 1.2%

LOOP

3V DIAS!OR WIN 8--

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400,6011

DATA

V4 VS IERECIDET -PNC-AF OUTPUT

12SK7 125Q7 35L6 -6T 38318 59V. HI V.

8

TI TO

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R52205

0.1

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SOR. PH.

Ctie150 - P -I

OTIOLLOSC.OPE CONNECTIONSVERTICAL III. TO THIS POINT --SPINAL -0- TO CHASMS

SOONR14

VOL OROWL: Ti .02

COMMON WIRINGINDICATESCHASSIS

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12557 10.2 NA.ATHODE CURRENTSNDICATES

125A7 6.1CHASSIS S 125X7 10.2

04 12569 0.11

3 NTT 56.566.3 1000

ALL CAPACITOR VALUES LESS THANTO ARE IN MP. AND ABOVE 1.0 AREIN WAR EXCEPT THOSE INDICATEDIN MF.

VOLTAGES MEASURED TO COMMONWIRING WITH VOLTOHNY5T, SHOULDHOLD WITHIN 20% WITH RATEDPOWER SUPPLY.

V4 VA

Tuning Range 540-1600 kc

Intermediate Frequency 455 kc

MEG

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AK

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In some chassis an alternate filter capacitor is used which has three sections. The low voltage section (20 mi. 25 volts) is not used. The alter-nate capacitor is mounted on top of the chassis and is available as Stock No. 73975.

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RCAVICTORMODEL A106

MODEL 9W106Chassis No. RC -622

Complete schematicdiagram shown onprevious page.

10.7 MC.TOP RESONANCESOT. CENTERING

T1POWERTRANS.

RECTIFIER

RATIO DET.

(TO

3 3 RPM ; 50

TOP 455 KC. PRI.BOT 10.7 MC.PRI.

TOP 10.714C. SECBOT.455KG. SEC

O

O

2ND. I.F. TRANSDRIVER

OEM PH.INV.

6V6aT

okr-TPU

O06 GT

OUTPUT

"X" PNONO. 45 R.P.M

P.M. ANT.TERM. BOARD

LI

RN I= 11 't190 MC FM. ANT.

I 4`.joll

LS 600KC

au

Oa AM RF

[

Nan-on

VOLUME CONTROLPOWER SWITCH

TONECONTROL

I

TOP 45550.5E0.BOT 4555C. PRI.

TOPSOT

10.7

TUNING

- - -VOL CONTROL & POWER SW. SHAFTS CONN. TOGETHER --

Alignment ProcedureCORRECT ALIGNMENT OF THE FM BAND

REQUIRES THAT THE AM BAND BEALIGNED FIRST

Alignment Indicators:An RCA VoltOhmyst or equivalent meter is necessary for

measuring developed d -c voltage during FM alignment. Con-nections are specified in the alignment tabulation. An outputmeter is also necessary to indicate minimum audio outputduring FM Ratio Detector alignment. Connect the output meteracross the speaker voice coil.

The RCA VoltOhmyst can also be used as an AM align-ment indicator, either to measure audio output or to measurea -v -c voltage.

When audio output is being measured the volume controlshould be turned to maximum.

AM AlignmentRANGE SWITCH IN BC POSITION

StepsConnect highside of sig.gen. to-

Sig. gen.output

Turn radiodial to-

Adjust forpeak output

AM windings.}bottom

1 coreore (sec.).Pin No. 5 T3 top

of V2in series 455 kc.

Quiet pointat low

core (pri.).

AM windings.}T2 topwith .01 mfd. freq. end.

2 core (sec.).T2 bottomcore (pri.).

3 1400 kc. 1400 kc.C1 -2T (osc.).CI -ST (ant. l.Cl-4T (rf.).

L8 (osc.) with4 Short wire

placed near10,000 ohmsresistor from

RF stator to gnd.loop for 600 ke. 600 kc. (rocking gang)-- radiatedsignal I.5 (RF)

5 with the 10,000ohms removed.

Repeat steps 3. 4 and 5 until no improvement in sensi-tivity is obtained.

t- Use alternate loading.Alternate loading involves the use of a 47,000 ohm resistor to

load the AM plate winding while the AM grid winding of theSAME TRANSFORMER is being peaked. Then the grid winding isloaded with the resistor while the plate winding is peaked. Onlyone winding is loaded at any one time. Remove the 47,000 ohmresistor after T3 and T2 have been aligned.

Oscillator frequency is above signal frequency on both AM andFM.

132

Tube and Trimmer Locations

106MG FM ANT.

CI -5T 1400KC AM ANT.

F. AMP.

CI -4T 1400 KC AM R.F.I -3T 106 MC F.M.

6 600 KC 05C.L3 90 MC FM ELF.

I -2T 1400 KC AM OSC.

MIXER &OSCILLATOR

L9 90 MC. FM OSC.

VOLUME CONTROL& POWER SWITCH

FUNCTION SWITCH

ADJUST FM COILS BYCHANGING SPACINGBETWEEN TURNS

Signal Generator:For all alignment operations connect the low side of the

signal generator to the receiver chassis. The output should beadjusted to provide accurate resonance indication at all times.If output measurement is used for AM alignment the output ofthe signal generator should be kept as low as possible toavoid a -v -c action.

FM AlignmentRANGE SWITCH IN FM POSITION-VOLUME

CONTROL MAXIMUM

StepsConnect highside of sig.gen. to-

Sig. gen.output

Turn radiodial to-

Adjust forpeak output

1

Connect the d -c probe of a VoltOhmyst to the negativelead of the 2 mfd. capacitor C42 and the common leadto chassis. Turn gang condenser to max. capacity (fullymeshed). Volume Control max.

2

Pin 1 of V46AU6 in

series with470 ohmresistor.

10.7 me.modulated30% 400

cycles AM(Approx..05 volt).

Max. ea-pacity(fully

meshed).

T4 top corefor max. d -c

voltage acrossC42.

T4 bottom corefor min. audio

output.

3 10.7 mc.Adjust to

provide about4 volts indi.cation on

VoltOhnlystduring

alignment.

FM windings.ftT3 top

core (see.).T3 bottomcore (pri.).

4

FM windings.ttT2 top

core (see.).T2 bottomcore (pri.).

S High and lowside of signalgen. throughtwo 120 ohmCI-3T

resistors.To ant.

terminals,

90 me. 90 mc.* L9 (ose.)$ 106 mc. 106 me. Cl-6T (ant.).

(rf.).

7 90 me. 90 mc. LI (ant.).1.3 (rf.).

.' Repeat steps 6 and 7 until no improvement in sensitivityis obtained.

Twu or more points may be found which lower the audio out-put. At the correct point the minimum audio output is approachedrapidly and is much lower than at any incorrect point.

Align T3 and T2 by means of alternate loading as explainedunder AM alignment. Use a 680 ohm resistor instead of a 47,000ohm resistor and load the FM windings. LI, 1.3 and 1.11 are adjustable by increasing or decreasing the

spacing between turns.f After dial pointer has been set accurately on calibration pointfor "A" band Isee dial indicator and drive drawing) tune receiverto 90 mc. on FM using dial scale as reference

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSRP -168 Series REPLACEMENT PARTS-Continued

STOCKNo.

ILL.No. DESCRIPTION

74427

7407474085

74075

7409974426

3372674083

7408174088

337267424574100

74078

74071

74624

74469

7462130870

73158

798597442874431

74041

74443

74824

75058

75073

74796

74061

74067

74625

74466

74984

*S-5578

74065

46

5051

52

545556575859

6061

626364656667

686970

71

7273

73

73

74

89909192

9

9

9

9

9

9

9B

10

10

10

10

10

10A

74464 10A

74986 10A

74069 10B74819 10B74068 10C

74818 10C

74622 10C

74985 10C

74230 10D

74065 11

1342

Spring (Reject lever spring (.203" O.D. x .531"-13turns) for sub -bases having two piece reject lever -2 required

Lever-Return lever (includes spring Ill. No. 51)Spring-Return lever actuating spring (.195" O.D. x

29/32"-371/2 turns)Spring-Return lever latch spring (.180" O.D. x .515.'-

211/2 turns)Washer

WasherTo clamp trip leverNut (Ill. No. 58) to pivot

Screw arm shaft (Ill. No. 40)Lever-Trip lever (includes Items 54, 55, 56, 57 and 59)Spring-Trip lever spring (.171" O.D. x .595"-30

turns)Washer-"C" washer for star wheel shaftScrew-No. 6-32 x .281" cone point set screw for star

wheel (2 required)Wheel-Star wheelSwitch-Muting switchScrew-No. 8 x I/4" self tapping screwWasher-"C" washer to retain trip pawl leverLever-Trip pawl leverSpring-Trip pawl take up spring (.195" O.D. x 5/e"-

201/2 turns)Clamp-Cable clampWasher-Dampening washer for idler wheel (bottom)Washer-No. 4 lockwasher for idler mounting stud

(Ill. No. 22)Nut-No. 4-40 hex nut for idler wheel mounting stud

(111. No. 22)Washer-Part of No. 74132-see M. No. 27Motor -115 volt, 60 cycle motor complete with con-

nector-shaded pole type. Not suitable for 50 cycleconversion

Motor -115 volt, 60 cycle motor complete with con-nector and No. 73158 spring sleeve (for 50 cycleconversion), shaded pole type

Motor -115 volt, 60 cycle motor complete with con-nector and 5 mt. capacitor-for RP 168-2 only

Capacitor-Motor capacitor (5 mf.) for No. 74469 motorConnector-Two prong male plug (connector) for mo-

tor cableSpring-Spring sleeve to convert motors No. 74624 to

50 cycle operationScrew-No. 8 x 1/4" self tapping screwClamp-To mount dash -potDash -pot --Pneumatic dash -pot complete with plungerWasher-"C" washer for mounting adjustment studs

No. 74429 (111. No. 45D) and No. 74430 (Ill. No. 45C)PICKUP ARM ASSEMBLIES

Arm-Pickup shell and stud-with pivot (9B) and leadcounter-balance-Type I for use with rest on motor -board

Arm-Pickup arm shell and stud-with pivot (9B) andlead counter-balance-for Model CP-5203 only-black finish

Arm-Pickup arm shell and stud-with pivot (9B) andlead counter-balance-Type II for use with rest onsub -base

Arm-Pickup arm shell and stud-with pivot (913) andlead counter-balance-for Model 45EY only-two-tone finish

Arm-Pickup arm shell and stud-with pivot (9B)-less lead counter-balance-Type III-for use witheither type of pickup rest

Arm-Pickup shell and stud-with pivot (9B)-lessbalance spring-Type V-tor use with either typeof pickup rest

Pivot-Pickup arm pivot-for use with arms No. 74041,No. 74443, No. 74824, and No. 75058 only (armsstamped 970988)

Pickup-Crystal pickup cartridge complete includingsapphire and guard-RMP 128-1

Pickup-Crystal pickup cartridge complete includingsapphire and guard-RMP 128-2

Pickup-Magnetic pickup cartridge complete withstylus-for Model CP-5203 only

Pickup-Ceramic pickup cartridge complete withstylus-for Models QJY and QEY3

Pickup-Ceramic pickup cartridge complete withstylus-for Model 9QV5

Screw-No. 2-56 x 3/16" fillister head screw to mountNo. 74067 or No. 74625 crystal pickups or No. S-5578ceramic pickup

Screw-No. 2-56 x fillister head screw to mountNo. 74466 pickup (Model CP-5203)

Screw-No. 2-56 x 3/16" screw for mounting No. 74984pickup (Models QJY and QEY3)

Guard-Stylus guard for No. 74067 pickup (RMP 128-1)Guard-Stylus guard for No. 74625 pickup (RMP 128-2)Sapphire-Sapphire and holder (WHITE) for No. 74067

pickup (RMP 128-1)Sapphire-Sapphire and holder (BLUE) for No. 74625

pickup (RMP 128-2)Stylus-Diamond stylus and holder for No. 74466 pick-

up (Model CP-5203)Stylus-Stylus and holder for No. 74984 pickup (Mod-

els QJY and QEY3)Washer and Nut-to mount No. 74068 or No. 74818

stylusScrew-No. 2-56 x 3/16" fillister head screw to Mount

stylus guard on No. 74067 or No. 74625 pickupsScrew-No. 8-32 x 13/32" cone point pivot adjusting

screw

STOCKNo.

ILL.No. DESCRIPTION

72765 13 Nut-Speed nut to hold pickup arm cable74801 - Clip-Spring clip to hold pickup arm cable (used only

on pickup arm Type V and VI-No. 74796)74410 14 Screw-No. 4-40 x 3 16" fillister head screw to lock

pivot screw No. 7406274066 15 Cable -3 -wire twisted pickup arm cable complete

with connectors74465 15 Cable-Shielded pickup arm cable complete with con-

nectors-Model CP-5203 only*S-5580 15 Cable-Shielded pickup arm cable complete with con-

nectors-Model 9QV5 only74060 39 Spring-Counter-balance spring (.171" O.D. x .695--

43 turns) for Pickup Arm Types I, II, III and IVwhen using No. 74067, No. 74625 or No. 74984 pick-ups (most models)

74426 39 Spring-Counter-balance spring (.171" O.D. x .595"-30 turns) for Model 9QV5 only

74461 39 Spring-Counter-balance spring (.185" O.D. x .695"-293/4 turns) for Model CP-5203 only

74798 39 Spring-Counter-balance spring (5,8" 0.D.-11 turns)for Pickup Arm Types V and VI (Stock No. 74796)

74797 - Nut-Speed nut to hold No. 74798 spring in PickupArm Types V and VI

75074 - Weight-Lead counter -balance weight for Pickup ArmTypes III and IV

- Screw-No. 4-40 round head screw to hold No. 75074weight to No. 75073 Arm

-74059 40 Arm-Pivot arm and shaft for use with all pickup

arms having lead counter -balance except ModelCP-5203

79744 40 Arm-Pivot arm and shaft for Model CP-5203 only74799 40 Arm-Pivot arm and shaft for use with Pickup Arm

Types V and VI74802 - Screw-No. 4 x 9/16" oval head counter -balance ad-

justing screw for use with No. 74799 pivot arm74800 - Bumper-Rubber bumper for No. 74799 pivot arm

TURNTABLE ASSEMBLIES74090 1 Nose-Spindle nose-RED (early type-thin wall) for

Turntable Type I74620 1 Nose-Spindle nose-RED (late type-thick wall) for

Turntable Type I or II74863 1 Nose-Spindle nose-RED-for Turntable Type III79472 1 Nose-Spindle nose-BLACK -for Turntable Type I74795 1 Nose --Spindle nose-BLACK--for Turntable Type III74091 2 Spring-Spindle nose spring - formed - for spindle

nose No. 74090, No. 74620, or No. 7447274862 2 Spring-Spindle nose spring-formed wire-for spin-

dle nose No. 74863 or No. 747953 Screw --No. 6-32 round head machine screw for spin-

dle .nose spring No. 74091-74095 4 Spring-Separator shelf return spring (.180" O.D. x

1 1 16"-10 turns) for Turntable Types 1 and II74866 4 Spring-Separator shelf return spring (.118" O.D. x3' "-16 turns)-two required --for Turntable Type

III74096 5-6 Separator-Separator knife, shelf and gear assembly

for Turntable Types I and II74865 5.6 Shelf-Separator shelf for Turntable Type III74864 5B Separator-Separator knife for Turntable Type III

6B74092 7 Shaft-Star wheel shaft and gear assembly for Turn-

table Types I and II74867 7 Shaft-Star wheel shaft with cam for Turntable Type

III33726 - Washer-"C" washer for top of No. 74867 shaft74042 8 Turntable-Turntable with TAN MARBLEIZED mat-

Type I --use No. 74090 RED nose thin wall'75065 8 Turntable-Turntable with TAN MARBLEIZED mat- --Type I -use No. 74620 RED nose thick wall74813 8 Turntable-Turntable with TAN MARBLEIZED mat-

Type III -use No. 74863 RED nose74445 8 Turntable --Turntable with BLACK mat --Type 1 --useNo. 74472 BLACK nose75145 8 Turntable -Turntable with RED mat-Type I-use No.

74472 BLACK nose75059 8 Turntable-Turntable with RED mat --Type III --use

No. 74795 BLACK nose74094 8C Mat-Turntable mat-TAN MARBLEIZED74471 8C Mat-Turntable mat-BLACK74794 BC Mat- Turntable mat- RED .

21 Screw --No. 6-32 x 134" fillister head screw holdsnose .to spindle) two required for Turntable Type I-74868 21 Screw-No. 6-32 x 156" fillister head screw .holds

nose to spindle) two required for Turntable TypesII and III

74869 21A Washer-No. 6 flat washer 'for use under No. 74868screw --two required for Turntable Types II and III

31 Screw --No. 4-40 x 38" fillister head screw for usewith cam, Ill. No. 33)-two required for Turntable-

Type I32 Washer-No. 4 lockwasher-for use with cam Ill.-

No. 33) -two required for Turntable Type I74231 33 Cam --Follower cam for Turntable Type 1

Two different main levers (director lever) are used, dependingupon which urntable assembly is used. Lever (41) Stock No. 74076has a long end (41C) and is used with Turntables Type I and II,Lever (41) Stock No. 74857 has a short end and is used with Turn-table Assembly Type III.

Items listed but without Stock Nos. are not stock items.

Parts list continued on page 138.

00

O

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSRP -168 Series CYCLE OF OPERATION

Function

Place records overthe center post andturn the power on

Explanation

1. Records rest on separator shelves protruding from either sideof the center post.

Push start -rejectknob

1. Start -reject knob which is linked to start -reject slide (45A)moves trip pawl (37) into tripping position.

2. As the turntable rotates, the small projection (BA) (extendingfrom the underside of the turntable) contacts end of trip

pawl.

Pickup arm rises

CYCLING CAM8B

Figure 3.

1. As the turntable continues to rotate it carries the trip pawl(37) along for a short distance.

2. The stud (37A) on trip pawl applies force against directorlever (41) in opposition to tension spring (42). -This force continues to be applied until the stud (41B) onthe director lever has been forced through the slot and intothe cycling cam (8B).

3. The end (41C) of the director lever extending below themotorboard moves away, allowing the muting switch (63)to close.

4. At the same time the stud (41A) pushes the pickup arm liftlever (35) which in turn raises the pickup arm.

DIRECTORLEVER

41

37A TRIPPAWL STUDAPPLIES FORCEON DIRECTOR

LEVERTENSION

SPRING42

Figure 5.

Pickup arm movesout

CLAMPING STUD 58ALATCH 50A

411RETURN LEVER Ay-PICKUP ARM 411,-

440;r7TENSION SPRING 51

PICKUP ARMMOVINGOUTWARD

41C

SEPARATOR SHELF

Figure 1.

TURNTABLE

8A STUDPOINT OF CONTACT

REJECT LEVER

Figure 2.

PICKUP ARM LIFT LEVER

MUTING SWITCH 63CLOSES

Figure 4.

TRIP

PAWL 3

1. The end (41E) of the director lever (41) contacts stud (58A)on trip lever (58), starting the pickup arm on its outwardmovement.

2. The stud (58A) on trip lever contacts pickup arm return lever(50), pushing it outward against the tension spring (51).

3. As the pickup arm reaches its outermost position, it is

locked in position by the latch (50A) clamping the stud(58A) on the end of the pickup arm return lever. Figure 6.

PICKUP ARMMOVES

OUTWARD

TRIPLEVER 58

135

LANDING IS DETERMINED BYSTUD 50B CONTACTING

ECCENTRICSTUD 45C

LANDING ADJ. STUD

PICKUP ARM RETURNLEVER

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSRP -168 Series

RECORDS

paRIMMIRMIZo

KNIFE r

SHELVES

5BI

KNERIFE

HAVE RECEDED

r RECORDDROPPING TOTURN TABLE

TURNTABLE

KNIFE

SH LF

Figure 8.

F gore 7.CAM

-46T64154WR

PARALLELSPRINGS

KNIFE

SHELF

STAR WHEEL 62

SPRING 4

CONTACT HERE 41CPREVENTS ROTATION

SHELVES MOVEIN AND OUT

Figure 9.

PICKUP ARM

111111111,11111.1.111111111111'1111111

41For...... ... ..

Mr57---"'17'12J

TRIP LEVER

Figure 10.

Figure 12. TENSION SPRING 42

LATCH 50ADISENGAGES

PROJECTION50 C

41C 11cP ;'

(qr(6''C.

136MUTING SWITCH 63

OPENS

Figure 14.

410

Figure 11.

TENSIONSPRING

51

41E RETAINSCONTACTWITH STUD

58A

PICKUP ARMRETURN

LEVER 50

Separator knivesseparate the lowerrecord from thestack and allowsthe record to dropto the turntable

Pickup arm movesin for landing

STU71744NTINUESTO CONTACT UNTIL SAPPHIRE

SETS ON RECORD

PICKUP ARM LIFTLEVER 35

Figure 13.

PICKUP ARM

9A

Sapphire is loweredto the record

STUN 8AREADY TOCONTAC TAND START

CYCLE AGAIN

Figure 15.

TRIP PAWL 37

TRIP LEVER58

Playing of recordis completed andmechanism startschange cycle

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSRefer to illustrations on page 136.

1. While the pickup arm is moving outward, the end (41C) ofthe director lever (41) extending below the motorboard, con-tacts and prevents the star wheel (62) from rotating.

2, Since the turntable continues to rotate and the star wheeland shaft remain stationary, the two small gears (5A and6A) embedded in the upper section of the center post rotatearound the gear (7A) on the upper end of the star wheelshaft (7).

3. The eccentric extending from the upper end of the twoembedded gears turns in a slot in the separator shelves(5 and 6). This causes the shelves to move in against thetension of spring (4).

A later type of record separators (knives and shelves), illus-trated in Figure 8, are actuated by a cam at the top of theshaft. No gears are used. The cam pushes out on the kniveswhich in turn pull in on the opposite shelves.

4. As the shelves recede the separator knives (5B and 6B),mounted above each separator shelf, separate the lowerrecord of the stack and support the remaining records whilethe lower record drops to the turntable.

1. As the director lever (41) continues to move toward the outof cycle position the end of the director lever (41E) retainscontact with the stud (58A) on the trip lever (58). This contactstabilizes the inward movement of the pickup arm whichis being pushed in by the pickup arm return lever (50).

2. The inward movement of the pickup arm is stopped directlyabove the landing position due to the stud (50B) on pickuparm return lever coming in contact with the eccentric stud(45C).

1. The stud (41A) on director lever (41) continues to contactpickup arm elevating lever (35) and lowers the sapphire onthe start of the record.

2. As the turntable completes one revolution, the stud (41B)on director lever is pulled through the slot in the cyclingcam by the tension spring (42).

3. The end of the director lever (41D) contacts projection (50C)and unlatches the pickup arm return lever (50).

4. The end (41C) of the director lever below the motor boardmoves away from the star wheel and opens muting switch.

1. After the selection has been completed the sapphire movesinto the tripping groove. At this time the trip lever (58)pushes the trip pawl (37) into position for engagement withthe stud (8A) on the underside of the turntable.

2. This contact between stud (BA) and the trip pawl (37) startsanother change cycle and the next record is moved intoposition for playing.

RP -168 Series

SERVICE HINTSCare of PickupLINT MAY COLLECT TO CLOG THE OPENING IN THE GUARDAT THE STYLUS POINT AND CAUSE POOR RECORD REPRO-DUCTION. This may require occasional cleaning of the guardopening-clean by carefully brushing with a small soft brush.

Replacement of StylusCaution: Never bend the stylus support wire.

CRYSTAL PICKUPS (Stock Nos. 74067 and 74625)Remove the two screws holding sapphire guard in place andremove the guard. Remove the small nut and washer on. thethreaded shaft of the sapphire holder and gently push theshaft through the hole in the armature shaft until the sapphireholder assembly comes free.Extreme care should be used when loosening the nut so thatthe twisting motion does not break the crystal. Take hold ofthe lower end of the shaft with a pair of pliers while looseningor tightening the nut, being very careful so as not to strip thethreads or break the crystal.Insert threaded shaft of replacement sapphire holder througharmature shaft and replace the washer and nut. Make surethat the sapphire is in the correct position.Replace the sapphire guard, positioning it by means of theoversize screw slots. Make certain that the sapphire and itssupporting wire are centered in the guard. Tighten the guardscrews. Before using, check to see that the sapphire projectsfar enough beyond the guard so that the guard will not touchthe record. If necessary, bend the guard a little.

VARIABLE RELUCTANCE PICKUP (Stock No. 74466)To remove the stylus assembly, insert a bent paper clip orequivalent tool into the stylus stud pin socket at point "A."Press the assembly out from the cartridge with the tool asshown by the arrow in the illustration below.To replace the stylus assembly, insert the stud pin into therecess "A," with the locating tab positioned above the locatingslot "B" between the two pole pieces. Press assembly in firmlyby applying pressure upon the stud pin at point "C" with ablunt tool. Care must be taken to press assembly only at point"C" so as not to damage or distort the stylus arm.

CERAMIC PICKUP (Stock No. 74984)To remove stylus, insert the point of a knife blade between thestylus wire and the case. The stylus may be pried out of itsrubber mounting with a twisting motion of the knife blade.To replace stylus, push end of stylus wire down into its rubbermounting. Be certain that the stylus is centered in the grooveof the pickup case.

NUT L WASHER NUT

SAPPHIRE

STYLUS

HOLDER

STUD PIN

wl

GUARDHOLDER

PICKUP CASE

STOCK NO. 74067OR 74625

STOCK NO.74466

STYLUSASSEM.

-a.--SOPCINIET

WASHER

SAPPHIRE

HOLDER

SUPPORT WIRE

STYLUS

0

Figure 16-Stylus Replacement.

KNIFE BLADEHOLDER

RUBBERMOUNTING

STOCK NO.74964

137


TURNTABLEASSEMBLY

SEE SEPARATEDRAWING

jl

138

PICKUP ARMASSEMBLY

SEE SEPARATEDRAWING

Figure 17-Exploded I of Subbase Assembly.

46

STOCKNo.

74623

Replacement Parts List

(Continued from page 134)

ILL.No.

47

4849

49- 4974209 75

74581 75

74424 76

74582 76

75057 76

73549 7774674 7774422 78

74423 79

74208 8074184 81

74444 81

75076 81

74987 81

74185 82

74446 82

75077 82

74210 8374467 8374421 84

74212 8586

33726 87

74211 8874474

DESCRIPTION

MOTORBOARD ASSEMBLIESHardware-To mount sub -base to plastic cabinet of

Models 9EY3, 9EY35, 9EY36, 9Y51, 45EY and QEY3or sub -base to motorboard of Models 9EY31 and9EY32, consisting of:Three (3) grommetsThree (3) spacersThree (3) flat washers c

ScreW-No. 8-32 x 34" - for Models 9EY3, 9EY35,9EY36, 9Y51, 45EY and QEY3

Screw-No. 8-32 x 1/2"-for 91Y and 451Screw-No. 8-32 x 38"-for instruments using spring

mounting of motorboardCover --Mounting screw cover (threaded type -3 re-

quired)-use with No. 74424 screw (Ill. No. 76)Cover-Mounting screw cover (plug-in type -3 re-

quired)-use with No. 74582 screw (Ill. No. 76)Screw-No. 8-32 x 13/4" special screw (with tapped

hole) for mounting record changer (3 required)-usewith No. 79209 cover (Ill. No. 75)

Screw-No. 8-32 x 13/4" special screw (non -tappedhole) for mounting record changer (3 required)-use with No. 74581 cover (Ill. No. 75)

Screw-No. 8 x 7/' oval head wood screw for mount-ing record changer (3 required)-for Models 9EY31and 9EY32

Emblem --RCA Victor" emblem-metalEmblem-"RCA Victor" emblem-plasticSpring-Conical spring for mounting record changer

-upper L.H. side (2 required)Spring-Conical spring for mounting record changer

-bottom (3 required)Nut-Tee nut for mounting record changer (3 required)Motorboard - Motorboard complete with welded

brackets and stud-less rest and operating parts-for all models with.motorbocird rest except CP-5203,9EY31 and 9EY32

Motorboard - Motorboard complete with weldedbrackets and stud-less operating parts-for ModelCP-5203

Motorboard - Motorboard complete with weldedbrackets and stud --less rest and operating parts-for Models 9EY3] and 9EY32

Motorboard - Motorboard complete with weldedbrackets and stud-less operating parts-for allmodels without motorboard rest

Rest -- Pickup arm rest - maroon - for all models(where required) except CP-5203, 9EY31 and 9EY32

Rest-Pickup arm rest-black-used on Model CP-5203 only

Rest-Pickup arm rest and latch-for Models 9EY31and 9EY32

Knob-Reject control knob-maroonKnob-Reject control knob-blackSpring-Conical spring for mounting record changer

-upper R.H. side (1 required)Nut-Speed nut for reject control knobScrew-No. 6 self -tapping screwWasher-"C" washer for mounting reject lever actu-

ating leverLever-Reject lever actuating leverSwitch-"ON-OFF" switch-used on Model CP-5203

only

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSRP -168 Series 4591

2274079

2374078

6974078

458

74091

74096

SEE NOTE

74042 SEE74445 LISTING7506575145

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74869

e4.-40 x 3/8"SCREW MS.)

2474077

OR74470

45SUB -BASE

74620 RED

74090RED} SEEOR

LISTING74472 BLACK

6-32 SCREW IN. S.)

74095

74096SEE NOTE

74092

IDENTIFICATIONNUMBER

9404893 R2OR }TYPE I

971009 TYPE II

FOR TYPE Ip6-32 X13/4"

SCREW (N. S.)FOR TYPE II

46 -32 x 15,i SCREW74868,

74231

4 LOCKWASHER (N. S.)

ON TYPE II TURNTABLES THE CAM (33) ISCAST INTEGRAL WITH THE TURNTABLE ( 8)

Figure 20 Turntable Assemblies,Types 1 and 11.

140

74864

74865

74867

74869

45 8174 870

2374078

2474077

69 Figure 19-74 07 8

Idler W'heelMounting.

45 BPLATE74814

74863 RED74795 BLACK

74862

74864

74 866

74865

C " WASHER33726

74813 WITH TAN MAT75059 WITH RED MAT

74094 TAN74794 RED

IDENTIFICATIONNUMBERP- 971009

- 32 X 1 5/8"SCREW74868

NOTE: Use care in dis-assembly to prevent loss ofsprings. Remove screws -hft nose slightly ---hold bothseparator knives down against shelves --then removenose.

Figure 21 Turntable Assemblies,Type 111.

Main Lever vs Record Separators:Two different main levers (director lever) are used dependingupon the type of record separators being used.Stock No. 74076 le,rer is used only with the rotating gear typeof record separators. The end (41C) that engages the starwheel is long.Stock No. 74857 lever is used only with the push -out type ofrecord separators. The end (41C) that engages the star wheelis h

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSCHANGES-SERVICE HINTS (Continued)

Figure 23-Motorbourd Assemblies.

Pickup Arm Rest:Two different types of pickup arm rest are in use. The originaltype was visible on the motorboard. The type presently in useis a metal projection on the sub -base.

Sub -base Mounting:The sub -base is attached directly to metal motorboards and tothe cabinets of Models 91Y, QJY and 451 with three screws andthree washers. No grommets or spacers are used except withModels 9EY31 and 9EY32.On all other instruments, the sub -base is cushion mounted tothe plastic cabinet with rubber grommets, metal spacers,screws and washers. The mounting is illustrated below.

STUD ONMOTOR BOARDOR PLASTICCABINET

SPACER

SUB BASE 45

GROMMET 47

FLAT WASHER 48

SCREW 49

SCREW 4908-32 X FORPLASTIC CABINETS

PICKUP RESTON CABINET

PICKUP ARM

STUD ONPICK UP ARM

RP -168 Series

AT UO ONPICKUP ARM

CABINET

SUB BASE

PICKUP RESTON SUB- BABE.

Figure 24-Pickup Arm Rest.

The late type (having a flat on the eccentric shaft) do not needto be grouped, but an early assembly should not be used inconjunction with a late assembly (use two early or two lateassemblies). The late type may be identified by its having ashroud at the top of the gear (see Figure 27).

Spindle Nose and Turntable (Type I):The wall thickness of the spindle nose (Ill. No. 1) has been in-creased and the machined shoulder at the top of the turntabledecreased accordingly. Thick wall spindle nose will not fit onearly type turntable. The new type red spindle nose (thickwall) is available as Stock No. 74620.NOTE: The screws (III. No. 21) which hold the spindle nose tothe turntable should not be tightened too tight. The spindlenose can be distorted and cause records to bind.

USING GROMMETSAND SPACERS.A9-32 X '2" FOR 9JY,

SPINDLE NOSE

ORIGINAL

Figure 26- Spindle Nose.SEPARATOR /OPP' E

OJY AND 45J. (THIN WALL)1.344"

*8.32 X FORMETAL MOTORBOARDWITHOUT USE OF

I. D.

NEW1,14101 WALL, 1

SEPARATOR SHELF

GROMMETS ANDSPACERS

Figure 25-Sub-base Mounting.

Separator Assemblies (Rotating Gear Type):A flat has been added to the separator gears eccentric shafts.This flat permits the shelf (Ill. Nos. 5 and 6) to stay out untilthe nose of the blade (Ill. Nos. 5B and 6B) is approximatelyhalf -way out. Then the shelf retracts fast. This taster actionminimizes unequal dropping of records.

The two types of separator assemblies (Stock No. 74092 Ill.

No. 7) are NOT INTERCHANGEABLE. In addition the earlytype has been grouped according to mold number (at bottomof spring hole) and installed in pairs.

Group Group .GroupMold Number Mold Number Mold Number

1, 3, 5 9, 10 0, 8

Assemblies of one group should not be mixed with assembliesof another group or unequal dropping of records may occur.If a matched pair is not available, first check timing of sepa-rator knives then the dropping of records; it may be necessaryto file the edge of the shelf which released the record last.

TURNTABLE

ORIGINAL1.342'0. D.

AT ...LOT ml

NEW

Jamming:On early RP -168-1 mechanisms it was sometimes possible tojam the mechanism by maintaining pressure on the rejectbutton during cycle. If such jamming should occur check the

following:1. The tip radius of the reject lever (Ill. No. 45A) should be

ECCENTRICN A PT

GEAR

SHROUDON TOP

OrGEAR

Figure 27-Separator Assembly.

2. The edges of the trip pawl WI. No. 37) should have a slightlyrounded edge (.010- radius).

Present production uses a two piece spring loaded reject lever(Ill. No. 45A` which eliminates the possibility of jammingcaused by pressure on the reject button.Jamming con also be caused by incorrect positioning of thedirector lever (main lever) (Ill. No. 41) in relation to the starwheel (Ill, No. 62). See Figure 35.

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GEAR 5A

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mica. :463,1N11.111,..4

I" 401'

CAMSCREW

STAR WHEEL

ADJUSTMENTS (Continued)

SHELVES MOVEIN AND OUT

GEAR 6A

GEAR 7A

Figure 32.

SEPARATORKNIVESSYNCHRONIZED

Figure 33.

gf-TOOTH

AtiLr."r

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SCREW

R -I105

Figure 34-Star Wheel Timing.

Director Lever Position:Push reject lever and rotate the turntable slowly by hand untilthe end (41C) of the director lever moves in to its limit of travelso when the star wheel is rotated it contacts by the amountindicated in Figure 35 for lever with long end. For lever withshort end, the star wheel should first contact the end (41C)approximately 1 16 -inch from the front or leading edge of thelever.If the end of the director lever (main lever) is too close to thestar wheel, it will jam. If too far away, it will cause erraticrecord dropping. If in doubt and unable to measure, move theend toward the star wheel until most of the play is removedwhen the star wheel is moved back and forth at this setting.With the push -out record separators and the lever with shortend, there will be considerable play but the tension of theseparator springs holds the star wheel against the lever.

41CEND OFMAIN LEVER

41MAIN LEVERSTOCK NO. 74076

41CEND OFMAIN LEV

STARWHEEL

( AT MAX.TRAVEL)

CORRECT SETTINGFOR "ROTATING GEAR" TYPEOF SEPARATORS

I/16"(FIRSTCONTACT)

41MAIN LEVERSTOCK NO. 74857

STARWHEEL

CORRECT SETTING

FOR "PUSH -OUT" TYPE OFSEPARATORS

Figure 35 Setting of Director Lever.

Sapphire Height Adjustment (Out of Cycle):Bend the lug on the pivot arm (40) so that the sapphire pointis approximately I,t,;" above the motorboard.

LUG ON PIVOT AR

OTOR BOARD

Figure 37.

RP -168 Series

Pivot Screw Adjustment:Loosen the pivot locking screw (14) and adjust the pivot screw(12) for minimum side play without causing binding.

9PICKUPARM

4PIVOTLOCKINGSCREW

I2PIVOTSCREW

1111,1111111r---Oti BPI VOT

MOTORBOARD

Figure 36.

40PIVOT ARM

Tripping Adjustment:1. Assemble the pickup arm and trip lever assemblies as

shown in Figure 38. Leave the clamping screw (57) looseenough to permit horizontal movement of the trip lever onthe shaft. (Allow approximately .010 inch vertical end play.)

2. Turn the eccentric landing adjustment stud (45C) to deter-mine the inward and outward limit of adjustment, then turnit to a setting half -way between the limits.

_°01NE*1°

PICKUP ARM

SCREW (57) &NUT (55)

I¶17' TRIP LEVER

--M113) ASEgr

SAPPHIRE (10C)

HORIZONTALMOVEMENT OFTRIP LEVER

Figure 38.

3. Tripping should occur when the sapphire reaches a posi-tion 1.1-'_;" from the near side of the turntable spindle. Thisposition is adjusted by holding the trip lever and movingthe pickup arm inward or outward to obtain the specifiedposition.

4. A convenient way of measuring this distance is to make amark on the back side of a stroboscope disc l'12" fromthe inner edge, place the disc on the turntable, with theturntable revolving, hold the disc stationary and move thepickup arm very slowly in towards the turntable spindle.

5. After this position has been obtained, tighten the clampingscrew (57) and recheck the tripping position and verticalend play.

Landing Adjustment:1. After the tripping adjustment has been made as described

above, turn the eccentric landing adjustment stud (45C) sothat the sapphire will set down on the record half -waybetween the outer edge and the first music groove. This

position is 25s" from the turntable spindle. The location of

the adjustment stud is illustrated in Figure 42.

143


SAPPHIRE POSITION

III

'1 WHEN TRIPPING

PICKUP ARM (9)him 321121111111=1111111

TURNTABLE (8) (37)

STUD(84TRIP PAWL

LOOSEN CLAMPING SCREW(57)TRIFAND ADJUST POSITION OF

TRIP LEVER 58 SO THATTRIPPING WILL TAKE PLACEAT SPECIFIED POSITION OF SAPPHIRE

SAPPHIREHALF -WAY

I -BETWEEN GROOVESAND RECORD EDGE

ARM»MOVEMENT

Figure 40-Landing Position. TRIP LEVER

Pickup Arm Height Adjustment (In Cycle):Set the mechanism in cycle. Turn the turntable by hand, untilthe pickup arm has reached its maximum height. By means ofa screwdriver turn the height adjustment stud (45D) until thedistance between the top of the turntable and the sapphirepoint is 3;1" Use that position of the eccentric stud whichcauses the pickup arm to rise during clockwise adjustment ofthe stud. The location of the adjusting stud is illustrated inFigure 42.

Figure 41-Height Adjustment.

Figure 42-Height and Landing Adjustment Studs.

TWISTED CABLE(IN SOME CABLES:

BLACK WIRE MAY BEOMITTED OR ASHIELDED WIRE MAYBE USED)

MUTING SWITCH

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSSears, Roebuck and Co. Chassis 132.977, Catalog Nos. 18 and 20.

AM ALIGNMENTPosition Generator Dummy Generator Generator Adjust Trimmer Trimmer

of Frequency Ant. Connection Connection In Order Shown FunctionVariable (high) Ground Lead For Max. Output

OpenOpen

455 Kc1850 Kc

.05 mid. Mixer GridTest Loop

ChassisTest Loop

Al, A2, A3, A4,AS

I.F.Oscillator

1400 Kc 1400 Kc 'Test Loop Test Loop A6 Antenna800 Kc 800 Kc Test Loop Test Loop Check Point Antenna

Connect generator lead to a Standard Hazeltine Test Loop, Model 1150, placed two feet from the set loop, or three turns ofwire about six inches in diameter, placed about one foot from the set loop. Or the generator can be connected with the highside lead to the AM antenna screw terminal and the ground lead to the chassis.

With a generator signal of 800 Kc, tune the set to the point where maximum output is obtained, which should be ap-proximately 600 Kc on the dial. Adjust antenna section places of variable for maximum output.

FM ALIGNMENTDetector and I.F. alignment using Signal Generator and Oscilloscope.

1. Connect FM Generator, High side, to grid (pin 1) of 8BA8 2nd I.F. tube through .005 mfd. dummy.2. Set generator frequency to 10.7 Mc. modulated either 80 cycles or 400 cycles, 250 Kc sweep (125 Kc. deviation).3. Connect vertical input of scope across volume control of receiver (grounded terminal to chassis, ungrounded terminal to

high side of control).4. Set scope switch for internal synchronization and set horizontal oscillator to 2X frequency of modulating voltage of

generator. (120 or 800 cycles)5. Turn variable condenser fully open, and band switch to right (FM).6. Adjust frequency vernier of horizontal oscillator on scope until the pattern becomes stationary.7. Adjust ratio detector primary slug No. A7 for maximum vertical sweep of the scope pattern.8. Adjust ratio detector secondary slug No. A8 to center the cross over point of the pattern. Pattern should look like Fig. 1,

with the same amount of curve on both ends, and the cross over point in the center.9. Connect generator, high side, to center antenna screw terminal on bottom of chassis.

10. Adjust I.F. slugs A9, A10 and All for the greatest verticalsweep of the pattern, consistent with linearity. If the I.F.slugs are adjusted for maximum sweep of the pattern, thepattern may become non-linear. Therefore, adjustmentshould be made for the greatest sweep which can be ob-tained and still have all four ends of the "X" patternsimilar in size and shape.

11. Check the alignment of the I.F. and detector circuits byvarying the signal generator frequency above and below thecenter frequency of 10.7 Mc. If the receiver is perfectlyaligned, two smaller "X" patterns of similar size and shapewill result, one on either side of the center frequency. SeeFigure 2.

Positionof Generator

Variable Frequency

Fully Open 108.5 Mc.

Fully Closed 87.5 Mc.105 Mc. 105 Mc.

91 Mc. 91 Mc.

DummyAnt.

*300 ohm300 ohm*300 ohm

300 ohm

R FGenerator

ConnectionHigh SideAnt. (FM)TerminalAnt. (FM)TerminalAnt. (FM)TerminalAnt. (FM)Terminal

X PATTERNCENTER FRECUENCY

SMALL X FAT TERNABC,/ E ONO BELOWCENTER FREQUENCY

=IRF10 I FIG 2

GeneratorConnection Adjust Trimmers

Ground Lead in Order ShownGround (G)

Terminal AltGround (G) Check PointTerminalGround (G) AIS

TerminalGround (G)

Terminal Check Point R. F.

TrimmerFunction

OscillatorOscillator

R.F.

For R.F. alignment use FM generator signal modulated with 400 cycles 45 Kc. sweep (22.5 Kc.) deviation). The 300 ohm dummy should be made up to two 150 ohm resistors, one placed in each lead at the receiver antenna terminals

POWERTRANS.

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Sonora Radio & Television Corp.

Models 299 (Walnut)

and 300 (Ivory).

12AU6 12AV6 5005CONVORDI 011141..010 OUTIM,

ALIGNMENT PROCEDURE

StepNo.

Positionof Gang

Signal GeneratorGeneratorConnectionFrequency

1. Open 455 KC.RearGang

Terminal

2. Open 1620 KC.

Dummy

Antenna3. 1400 KC 1400 KC

4. 600 KC 600 KC

CW40704

35W4411WfMN

Dummy Adjust- Type of Sche- SonoraAntenna ment Adjustment matte Part

Location No.

.1 Mfd.Slugs

Top andBottomin can.

Adjust forMaximum

Output

2 TurnsofHookupWire 6" inDia. (PlaceApprox. aFoot from

and inSame Plane

as Loop)

FrontGang

Trimmer

DESCRIPTION

Cl N-6385 Condenser, Ceramic 50 MMFD. 500V.C4 N-1345 Condenser, Paper .05 MFD. 200V.C7, C9 N-6015 Condenser, Ceramic 100 MMFD. 500V.C8 N-2063 Condenser, Paper .003 MFD. 600V.CIO,C15 N-1344 Condenser. Paper .01 MFD. 400V.C11 20 MFD. 15V.Adjust1C12 N-7153 Electrolytic 20 MFD. 160V.C13 40 MFD. 150V.for

Maximum C14 N-1346 Condenser, Paper .05 MFD. 400V.Output RI N-4277 Resistor 2.2 Megohm 1/2W 20%

Volume Control -2.0 MegohmR2 N-7142 Resistor 6.8 Megohm V2W 20%R3 N-4028 Resistor 330,000 Ohm V2W 20%R4 N-4423 Resistor 470,000 Ohm V2W 20%R5 N-4027 Resistor 180 Ohm 1/2W 10%R6 N-4067 Resistor 2,200 Ohm V2W 10%R7 N-4896 Resistor 68 Ohm 2.0W 10%R8 N-6014 Transformer, I.F.T1 N-7694 Oscillator CoilLI N-7725 Loop Antenna Coil

N-7670 Variable CapacitorN-7141 Speaker, 4" PM with OutputN-7824 Transformer

RearGang

Trimmer

Adjust forMaximum

Output

CheckGangAlign-ment

ALIGNMENT PROCEDURE

NO.POSITIONOF GANG

SIGNAL

FREQUENCY

GENERATORCONNECTIONGENERATOR

DUMMYANTENNA

TYPE OFADJUSTMENT ADJUSTMENT

ISTEP

1 . OPEN 455 KC.REAR GANGTERMINAL. . I MFD. T2.C9 & C8

ADJUST FOR MAXI -MUM OUTPUT

2. OPEN 1620 KC. LOOP.0002MFD.

FRONT GANGTRIMMER

ADJUST FOR MAXI MUM OUTPUT

3. 1400 KC. 1400 KC. LOOP.0002MFD.

REAR GANGTRIMMER

ADJUST FOR MAXI MUM OUTPUT

4. 600 KC 600 KC. LOOP

I2SA7 GT

156

RSK7OT

7-A

Sonora Radio

Model 306

.0002 CHECK GANGMFD. ALIGNMENT C19, C20

DESCRIPTION

Capacitor - Electrolytic - 40 MFD. 150 V.40 MFD. 150 V..

1200713T SoLeGTC5,C11 Capacitor - Ceramic 100 MMFD. 500V. 20%C12 Capacitor - Ceramic 100 MMFD. 500V. 10%C15 Capacitor - Ceramic 250 MMFD. 500V. 20%C13 Capacitor - Paper .005 MFD. 600V.C18 Capacitor - Paper .01 MFD. 400V.C18 Capacitor - Paper .02 MFD. 400V.C6,C7,C 14 Capacitor - Paper .05 MFD. 200V.C21 Capacitor - Paper .05 MFD. 400V.CIO Capacitor - Paper .09 MFD. 200V.C17

R5

Capacitor - Paper .1 MFD.

Control - On -Off & Volume

400V,

R12 Control - ToneR14 Resistor - 33 Ohm - 1/2W. 20%R10 Resistor - 180 Ohm - 1/2W, 10%R1 Resistor - 22,000 Ohm - 1/2W. 20%R9 Resistor - 33,000 Ohm - 1/2W. 20%R4 Resistor - 47,000 Ohm - 1/2W. 20%R2,R8 Resistor - 220,000 Ohm - 1/2W. 20%R11 Resistor - 470,000 Ohm - 1/2W. 20%R3,R6

°Z.ZR7Resistor - 1.0 Megohm - 1/2W. 20%Resistor - 6.8 Megohm - 1/2W. 20%

R13

tor

Resistor - 1,000 Ohm - 1.0W. 10%

T1 Transformer - 1.F. 41T2 Transformer - T.F. 02

.11.1.1.1.1.706 T3 Transformer - Output

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMS(FM) I.F. 10.7 MC.

(AM) I.F. 455 KC.

STfUJARFLUORIHRAM -FM RADIOMODEL 9151-A

HOW TO REMOVE CHASSIS FROM CABINET

1. Remove all knobs by pulling them forward.

2. Take off dial scale by pressing down on top center of plastic dialenclosure and at the same time pulling it forward.

3. Remove pointer by pulling it forward.

4. Remove cabinet back by taking out three screws and two clips.Note: Cabinet back has a power cord interlock which is auto-

matically disconnected when back is removed.

5. Take out two chassis mounting screws at bottom of cabinet. Chassis

may now be readily removed by sliding it out of cabinet.

6. When replacing cabinet back be sure that it is parallel to loop andpower cord interlock plug fits into socket on chassis.

AM OSC.COIL

507939

FM OSC.COIL

508225

TERMINAL D IS LOCATED3/4 TURN FROM

TERMINAL C

FM R.F.COIL

508224

S13S3 o S4 SI o S14

52- 55 SII SI5

51 S6 si 16

SECTION 1FRONT VIEW

S8

SECTION 1REAR VIEW

BAND SWITCH508231

Lettered terminals in illustrations correspondto similarly lettered terminals on the circuitdiagram.

157

MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSStewart -Warner Model 9151-A, Continued

BROADCAST BAND-"AM"-ALIGNMENT PROCEDURE1. If alignment of both AM and FM channels are required, it is advis-

able to align the AM channel first; then align the FM channel asinstructed on Page I5 9,

2. Remove chassis and loop antenna (which is mounted to chassis) from

cabinet by following procedure outlined on Page IS7 Allowloop to remain attached to chassis.

3. In order to provide a coupling for signal generator during R.F.alignment as instructed in chart below, wind several turns of wire ina circular shape so that it may be placed adjacent and parallel tothe loop.

4. Connect an output meter across the speaker voice coil or from the

plate of the 50135 tube to chassis through a 0.1 Mfd. condenser.

5. Set band switch to the "AM" (counter -clockwise) position.

6. Set volume control at maximum and use a weak signal from thesignal generator.

7. Since the dial scale is a part of the cabinet, when completely as-sembled, it becomes necessary to provide a temporary means oflocating the dial to obtain calibration points. Rotate gang condenserfully counter -clockwise and replace pointer so that it is parallelwith base of the chassis. Now, hold dial scale in front of pointer insuch a position that the ends of the indicator point to the "AM" and"FM" markers. While holding the dial scale in this position, rotatetuning sleeve until pointer indicates desired frequency.

SIGNAL GENERATOR CONNECTIONSSIGNAL

GENERATORFREQUENCY

RECEIVERDIAL

SETTING

TRIMMEROR SLUGNUMBER

TRIMMERDESCRIPTION

TYPE OF ADJUSTMENTCONNECT HIGHSIDE OF SIGNALGENERATOR TO

CONNECT GROUNDLEAD OF SIGNALGENERATOR TO

Lug on trimmer #6af top of gang (seefigure 1 for locationof trimmer).

Chassis ground.

CAUTION: If your sig-nal generator is de-signed with an AC -DCtype power supply,connect ground lead ofsignal generator to re-ceiver chassis througha .25 Mfd. condenser.

455 KCAny pointwhere it doesnot affect thesignal.

1 and 2 2nd I.F.

Adjust for maximum output. Thenrepeat adjustment.

3 and 4 1st I.F.

Connect directly to coupling turn. See Step 3above for instruction on coupling loop. I JUL/ Mi.

1500 KCSee Step 7above for in -structions onhow to obtainthis calibrationpoint.

5 AMOscillator Adjust for maximum output

Connect directly to coupling turn. See Step 3above for instruction on coupling loop. 1 500 KC

Tune to 1500Kc. generatorsignal.

6 AMAntenna

Adjust for maximum output

OSC.108 MC.

OSC. ® -1500 KC. -st, °Q!5 -4eR.F. 0106 MC.

@_il!7) [LiANT.

500 KC.®

HL1J

455 10.7KC. MC. MC. KC.

DISCRIMINATORSECONDARY

10.7 MC.

10.7 455

FIG. 1 Top View of Chassis

158455 10.7 10.7KC. MC. MC.

Bottom View of Chassis

FIG. 2

FMOSC. COIL

88 MC.

FMR.F. COIL

98 MC.

455KC.

GROUND TORECEIVERCHASSIS

12AL5

OISCRIMIIIMA -A f C

FIG. 3VTVM Connectionsfor IF Alignment

12AL5

DISCRIMINATOR -A V C

FIG. 4VTVM and Oscilloscope

Connections forDiscriminator Alignment

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ove

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enna

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ount

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cha

ssis

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om c

abin

et -

-allo

w lo

op to

rem

ain

atta

ched

to c

hass

is.

Rep

lace

the

dial

sca

le o

n th

e sh

aft o

f th

e ga

ng c

onde

nser

.Si

nce

the

"pos

ition

indi

cato

r" f

or th

e di

al s

cale

is a

n in

tegr

al p

art -

of th

e ca

bine

t, it

beco

mes

nec

essa

ry to

inst

all a

"te

mpo

rary

poi

nter

" w

hen

the

chas

sis

is r

emov

ed f

rom

the

cabi

net.

Thi

s ca

n re

adily

be

acco

mpl

ishe

d by

sec

urin

g a

piec

e of

hea

vy w

ire

unde

r th

e ri

ght f

ront

gan

g co

n-de

nser

mou

ntin

g sc

rew

and

sha

ping

the

free

end

of

the

wir

e so

that

it c

an b

e pl

aced

in a

ver

tical

pos

ition

dir

ectly

in f

ront

of

the

dial

sca

le.

With

the

gang

con

dens

er f

ully

mes

hed,

the

"tem

pora

ry p

oint

er"

shou

ld a

ppea

r di

rect

ly in

fro

nt o

f th

e fi

ne li

ne p

rece

ding

"55

" on

the

dial

Cou

ple

the

sign

al g

ener

ator

to th

e re

ceiv

er b

y co

nnec

ting

its o

utpu

t to

seve

ral t

urns

of

wir

e fo

rmed

in a

cir

cula

r sh

ape

so th

atit

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STROMBERG-CARLSON SERVICE NOTESRADIO RECEIVER MODEL 1500

. ALIGNMENT PROCEDURE

CAUTION: As this is a transformless Receiver, observe all usual precautions. The Black -White (B-) lead is common to one side of the117 Volt Power Line Cord.

Pointer Setting Generator Setting Input and DummyVTVM and Scope Connection

and Scale Adj. and Notes

I. F. ADJUSTMENT

(1) Low frequencyend of dial

455 kc.400 cy. mod.

Pin V. 12BE6tube0.01 mfd. dummy

-3V DC Scale Green.White (AVC) lead andBlack -White (13-) lead.

Adj. top and bottom cores ofeach I. F. transformer with non -metallic screwdriver for maxi-mum voltage.

(2) .. 455 kc.Swept 15 kc.

.. Scope to Junction C-6and Volume Control

Adj. same cores as above forbest over -lapping curve on scope.

R. F. ADJUSTMENT

(1) 1650 kc.Condenser platesall way out

1650 kc.400 cy. mod.

Ant. terminal0.01 mfd. dummy

"Adj. Osc. (front) trimmer on

variable condenser for maxi -

mum voltage.

(2) 1400 kc. 1400 kc.400 cy. mod,

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ALIGNMENT PROCEDURE

SIGNAL GENERATORTUNER

SETTINGFrequencyCouplingCapacitor

Connection toRadio

CL 0Capacitor full open

0 O 455 kc. .1 mf. 12BE6, Pin 7 (plates out of mesh)0Li

CN.1 1620 kc. .1 mf. 12BE6, Pin 7 Capacitor full open(plates out of mesh)

411)

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535 kc. .1 mf. 12BE6, Pin 7 Capacitor fullyclosed

T9ECD(1)

1400 kc.Lay Generatorlead near back

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1400 kc. signal

c'tn. zo-0 <- 400 cycles .1 mf. 12AT6, Pin

ADUST FORMAXIMUM OUTPUT

Top and bottomCores in output

and input I.F. cans

Oscillator trimmerC1 -D on gang

Check foradequate range

Antenna trimmerCI -C on gang

XI

Western Auto, Truetone Model D2004 (4B115 - Series A)155

Frequency Range 535 to 1625 kc.

Intermediate Freq . 455 kc.

3p 4

SPEAKER

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MANUAL OF 1950 MOST -OFTEN -NEEDED RADIO DIAGRAMSWeaiinyhoue eldric Corporation

Model H-198, Chassis V-2137-2

NO. 47 PILOT LAMPS

___

iiEnig.I E IF

.

RATIO DEY S17-40111C-R®TRAMS

54 A k - ---%.s

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FM 05G. TOWG52

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455 SGTRAMSFM ANT. TRIM...4.657

TRANS. RATIO OCTTENSION SPRING --

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x94 1F

TRANS.

CSTRANS.

SY 3GT

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:..f--'

ei.z.

10.7 MC FRONTqb00.22T et

Connect an output meter across the speaker_voiceWhile making the following adjustments,

tone control set for maximum treble, andaction.

ALIGNMENTBroadcast

keepthe

IlliPlitBand ,i TuReos

0.1."t 1 y iu888

coil.the volume control set for maximum output, the

signal generator output attenuated to avoid A.V.C.

StepConnect SignalGenerator to -


RadioDial

Setting Adjust

1 Set the band switch to AM.

2 Stator of tuning capacitor (C58)through a 0.1 mfd capacitor

455 kc. . maximumcapacity

455 kc. pri. and sec. of 1st and2nd I -F trans. for max. output

3 Radiated signal (no actual con-nection)

1600 kc. 1600 kc. AM osc. trimmer (C55) for max.output

4 Radiated signal (no actual con-nection)

1400 kc. tune tosignal

AM ant. trimmer (C10, located onrear cover) for max. output (rock -in adjustment)

1..T .7, ,. .,

1.23

68A6.2 u p

6AL51,..TopL, e.2 02T -70

Z2 0 lialk .51_ ir 230 210 ,2 0 RaTIO OCT .L

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ROTCI SELECTOR SWITCH 5W2 IS SHOWN IN EXTREME 1003TER ..021.052 50517105 OR FM 110 vINCE CON DISCONNECTED

FIRST POSITION CLOCKWISE 15 AM WO 5 ALL VOLT EASURED FROM CNSSiS 010 I USING 20,000 OHM / VOLT MEYERt. NOT USED IN EARLY 01SSS L i. 7 vac VOLTAGES SNOULD AE S SmOmm . 5E5 cEmy-3. TO SE INSTALLED FOR LIGNMENT ONO 171

MANUAL OF 1950 MOST

Waslinghouse I. AM OSC. TRIM -05S

FM OSC. TRIM.-054

Model H-199 AM ANT. TIIIM.-CST

Chassis V-2137-1 FM ANT. TIROL CSS

F.M. AlignmentConnect Signal

Step Generator to -GeneratorFrequency

DialSetting Adjust

I Set the band switch to FM.2 Connect two 100,000 ohm resistors (the resistances must be equal within 5 percent) be-

tween pin #7 of the 6AL5 tube and ground as shown on the schematic diagram.

Connect a V.T.V.M. between points "X" and "Y" (see schematic diagram).4 Stator of FM ant. section 10.7 mc.

(C52) on tuning capacitorthrough a .01 mfd mica

5 Connect the V.T.V.M. between point "Z" and ground.6 Same as step 4 10.7 mc.

maximumcapacity

maximumcapacity

Sec. of ratio det. trans. forzero (use medium strengthsignal)

Pri. of ratio det. trans. andpri. and sec. of .10.7 mc. 1stand 2nd I -F trans. for max.

NOTE: The pri. of the ratio det. trans. peaks in two places. Use the Peak with the slugfarthest out.7 Reconnect the V.T.V.M. between points "X" and "Y", and increase the signal strength 2

times.

8 Same as step 4 10.7 mc. maximumcapacity

1 Recheck sec. of ratio det.trans. for zero voltage

9 Reconnect the V.T.V.M. between point "Z" and ground.

10 Same as step 4 10.7 mc. maximumcapacity

Pri. of ratio det. trans. formaximum voltage

11 Remove the two 100,000 ohm resistors that were

12 FM ant. terminal through a l 105 mc.300 ohm non -inductive resistor

105 mc.13 Same as step 12.

172

ItAT7F. 71111117roca

N.T.I VINTON SO IS SNOWS ft 00UNTIIR OLOISLINISI

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2 TO SO VON AL ISIONCIT ONLY.

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POSITION

inserted in step 2.

105 mc. FM oac. trimmer (C54) formaximum output

105 mc. FM ant. trimmer (C56) formaximum output

'Mint AW,

qo«

OWN AMPSOS IN NANO 00101 0011. 011100101110,10 .

. ALL VOLTAM. InA80010 FNON ONASSIS NMI LIM. A 20.000 Mot/VOLT meTtliLIME VOLTAINI IIT r. A .C. NOLTAOIS SIAM. St Al SNOOK 1; 20 PEN CENT.

MANUAL OF 1950 MOST -OFTEN-NEEDED RADIO DIAGRAMS

Weotineihouoe electric Corporation Models H-210 and H-211

Chassis V-2144 and V-2144-1

ALIGNMENTWhile making the following adjustments, keep the volume control set for maximum

output and the signal generator output attenuated to avoid AVC action.

Step

Connect SignalGenerator to --

SignalGenerator

Frequency

RadioDial

Setting Adjust

1. Stator of R -F tuning capacitor (C7)through a 0.1 mfd capacitor

455 kc. maximum

capacity

Pri. and sec. of 1st and 2nd I -Ftransformers for max. output

NOTE: If the I -F transformers areobtain sufficient output to use thenecessary to align each transformerformer and work forward, connectingof the tube preceding the transformer

badly sis-aligned, it may be impossible to

above system. In this event, it will be

separately. Start with the last 1.-F trans-

the signal generator to the control grid

under alignment.

2. Radiated signal (no actual con-nection)

1615 kc. minimum

capacity

Oac. trimmer (C10) for max. output

3. Radiated signal (no actual con-nection

1400 kc. 1400 kc. Ant. trimmer (C8) for max. output

IIPILOT LAMP 'Mri -77

I I IN V -2144-I1 i I(USEDCHASSIS ONLY) MEM

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V4144 CHASSIS 11.1 -2101 IN PLACE OF THE PILOT LAMP.

4 3 3 3 4 3

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Weitinghouie electric Corporation

MODELS H -305C8 AND H -306C8(MAHOGANY) (BLONDE)

CIS.005

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Chassis V-2137-4

Alignment on page 178.

POWER

1

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TUNER ASS, MIN 53, 1.7

NOTE3E1won mac. 542 AND 5123 ARE .02/11 WI EXTREME COUNTER CLOCKWISE POSITION on Fr 5555 2 TO BE 1 AAAAA Leo non ALIGNMENT ON.FIRST POSITION CLOCKWISE IS Ali GA. 3. ALL VOLTAM MESUREO FROM GNAWS 1.01 M. 20W00 0104/.1.1 WT. LIM VOL..S..0 POSITI. CLOCKWISE IS .0. SET AT 111 V C VOLTAGES aNWLO GE AS SNOW. .e 20 P. CENT

CHASSIS NO. V-2137-4

E NOTE 2

00K

177

MANUAL OF 1950 MOST -OFTEN -NEEDED

WestinghouseRADIOMODELS H -305C8 AND H -306C8

See page 177 for schematic.NO NA pr,OT L AMPS

TELEVISION

(Continued)

RADIO DIAGRAMS

1

I I_o

11

M OSC TRIM.-C16C42

OU PU

6ARM

6

CAI

11:R S MM

IIFM OSC TRIM-CIO6V6 I '4RA :IM ANT TRIM.-

C44

C411

-3.....e.I 5.7 i

2s17 /01'© 2 '3 I -F , ST I -F

FM NT. TRIMASS C

TRANS TRANSC4TTRANS RATIO DET RATIO SET e,.._ 455K. _.(s)

12617 5-

TRANS. 4 1: CO TRANS

s 5Y3/01'

TRANS

P (SD

TRANS.NS -F ®, -- 10.7 MC I® IrVA,I-,F.

10.7 MG

7' " ''4'' 1-4-1.--11

PHONO MOTOR CHASSIS NO. V-2137-4PHONO SOCKETINPUT

CHASSIS NO. V-2137-4 BOTTOM VIEW

TOP VIEW ALIGNMENT

BROADCAST BANDConnect an output meter across the speaker voice coil.While making the following adjustments, keep the volume control set for maximum output, the tone

control set for maximum treble, and the signal generator output attenuated to avoid A.V.C. action.

Step Connect SignalGenerator to-


RadioDial

SettingAdjust

1 Set the band switch to AM.2 Stator of tuning capacitor

(C44) through a 0.1 mfdcapacitor

455 kc. maximumcapacity

455 kc. pri. and sec. of 1st and 2nd I -F trans.for max. output

NOTE:system.work forward,

If the I -F transformers are badlyIn this event, it will be necessary

connecting the signal generator

mis-aligned,to align each transformer

to the control

it may be impossibleseparately.

grid of the

to obtain sufficient output using the aboveStart with the last I -F transformer and

tube preceding the transformer under alignment.3 Radiated signal (no actual

connection)1600 kc. 1600 kc. AM osc. trimmer (C46) for max. output

4 Radiated signal (no actualconnection)

1400 kc. tune to AM ant. trimmer (C48) for max. output (rock -in adjustment)

Do not align the FM circuits untilFM

all AM adjustments

BAND

have been completed.

Step Connect SignalGenerator to-


-RadioDial

SettingAdjust

1 Set the band switch to FM.2 Connect two 100,000 ohm resistors

6AL5 tube and ground as shown(the resistances

on the schematic

-must bediagram.

equal within 5 percent) between pin No. 7 of the

3 Connect a V. T. V. M. between points "X" and "Y" (see schematic diagram).4 Stator of FM ant. section

(C43) on tuning capacitorthrough a .01 mfd mica ca-pacitor

10,7 mc. maximumcapacity

Sec. of ratio det. trans. for zero (use mediumstrength signal)

5 Connect the V. T. V. M between point "Z" and ground.6 Same as step 4 10.7 mc. maximum

capacityPri of ratio det. trans. and pri. and sec. of 10.7mc. 1st and 2nd I -F trans. for max.

NOTE: The pri of the ratio det. trans. peaks in two places. Use the peak with the slug farthest out.7 Reconnect the V. T. V. M. between points"X' and "Y", and increase the signal strength 10 times.8 Same as step 4 10.7 mc. maximum

capacityRecheck sec. of ratio det. trans. for zero voltage

9 Reconnect the V. T. V. M. between point "Z" and ground.10 Same as step 4 10.7 mc. maximum

capacityPri. of ratio det. trans. for maximum voltage

11 Remove the two 100,000 ohm resistors that were inserted in step 2.. 12 FM ant. terminal through a

300 ohm non -inductive resistor105 mc. 105 mc. FM osc. trimmer (C45) for maximum output

--13 Same as step 12 105 mc. 105 mc. FM ant. trimmer (C47) for maximum output

178


Weilinyhowe electric CorporationH -310T5, H -311T5, H-310T5U, AND H-311T5U

V-2161 AND V -2161U CHASSIS

ALIGNMENTIt is recommended that the chassis be isolated from the power line by means of an isolation

transformer.Make certain that the dial pointer is correctly positioned. When the gang is completely closed, the

pointer should be over the small bump near the left end of the dial background.While making the following adjustments, keep the volume control set for maximum output and the

signal generator output attenuated to avoid AVC action.

Step Connect SignalGenerator to -


RadioDial

Adjust forMaximum Output -

1 Stator of R -F tuning capacitor(A) through a 0.1 mfd capacitor

455 kc. Minimumcapacity

Top and bottom slugs in 2ndand 1st I -F trans. in ordergiven *

2 Same as step 1 1615 kc. Minimumcapacity

Osc. trimmer (D)

3 Radiated Signal 1400 kc. 1400 kc. Ant. trimmer (B)* It is recommended that a fiber aligning tool that snugly fits the slot in the powdered iron core be used to prevent

chipping of the slot.

TENSION SPRING

LZIE6CONVERTER

POINTER

DIAL DRIVE

CHASSISV -2161U ONLY

2)i TURNS

12946LF

5 6

MAV6WC In AUDIO

T22N.C1 IF

TRANS.

DM. 0,NOTEI . LL VOLTAGES MEASURED FROM CHASSIS GROUP., V 216I ONLY/ OR COuto. NE GAT I, 2.61 ONLY I //SING 20,000 ONA, VOLT METER.

LINE VOLTAGE SET T I IT N . C. READINGS SNOULO RE AS SNOWS 20 PER CENT.

CONVERTER

TiU IF

TRANS.

SOCS

A B ANT. TRIM.

CI

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